wiring problem
Freshman User
Joined: Apr 2009
Posts: 41
Likes: 2
From: eastern Montana
Sorry to hear of your troubles Draginlow. This is just a thought, for what it's worth. I have read posts by others here in the past regarding a leaking windshield gasket causing corrosion in the fuse block circuitry. Perhaps some severe corrosion there in a bad spot could cause a high resistance current leakage path that might intermittently activate certain systems or relays even though the key is off.
Thread Starter
|
Junior User
Joined: Jun 2009
Posts: 53
Likes: 0
Sorry to hear of your troubles Draginlow. This is just a thought, for what it's worth. I have read posts by others here in the past regarding a leaking windshield gasket causing corrosion in the fuse block circuitry. Perhaps some severe corrosion there in a bad spot could cause a high resistance current leakage path that might intermittently activate certain systems or relays even though the key is off.
New User
Joined: Jan 2010
Posts: 1
Likes: 0
similar problems
hi all, i recently started experiencing similar problems with my 99 f350 sd...
it started out with the airbag light and the control module beeping. then a series of clicking in the dash area. i noticed that my aftermarket radio wouldn't turn off and neither would the power to the windows and heater blower motor. this lasted for about 2 hrs then seemed to correct itself. all was good except for the window power not wanting to shut off, even with key removed and door open. Sunday after xmas i came out to find a stone cold dead battery, i replaced it as it was at least 3 yrs old and i didn't want to trust it anymore. all was good till i put in the new battery and found out the blower motor and interior light was freaking out, coming on and off by themselves. I've resolved myself to just make sure all was off when i shut the truck down for the night, and for a week all was good last Sunday my service engine soon light came on and the truck started shifting super hard, my buddy read the code and it was speed control sensor, no problem, $30 from ford and 15 min. later i was back in business. now comes today. i drove to work and while driving the airbag light came on again, and stayed on for 70 miles. i had someone read code and it was somthing like low voltage to control unit. i had 13.7 volts in the system so i couldn't understand why the code??? we reset the light and cleared the codes and after 30 min of driving it was back on again. i stopped and had codes read and there were no codes stored but light was still on. now comes the fun part. there is a relay that controls the blower motor,dome light and radio power and it is freaking out. i hear it coming from under the dash somewhere behind the radio/ heater control panel but i cant seem to find it. am i going to have to tear out most of the dash to get to this relay?? I've also replaced the ignition switch already and it didn't help. there are no obvious wire damage and i have gone through and wiggled and disconnected ,reconnected all the harness plugs i can get to. this is driving me crazy and my new york inspection is due next month. i can find no help with the manuals i have and I've picked the brains of all i know about this. can anyone help with what seems to be a common problem with these trucks??? my thanks to all.
it started out with the airbag light and the control module beeping. then a series of clicking in the dash area. i noticed that my aftermarket radio wouldn't turn off and neither would the power to the windows and heater blower motor. this lasted for about 2 hrs then seemed to correct itself. all was good except for the window power not wanting to shut off, even with key removed and door open. Sunday after xmas i came out to find a stone cold dead battery, i replaced it as it was at least 3 yrs old and i didn't want to trust it anymore. all was good till i put in the new battery and found out the blower motor and interior light was freaking out, coming on and off by themselves. I've resolved myself to just make sure all was off when i shut the truck down for the night, and for a week all was good last Sunday my service engine soon light came on and the truck started shifting super hard, my buddy read the code and it was speed control sensor, no problem, $30 from ford and 15 min. later i was back in business. now comes today. i drove to work and while driving the airbag light came on again, and stayed on for 70 miles. i had someone read code and it was somthing like low voltage to control unit. i had 13.7 volts in the system so i couldn't understand why the code??? we reset the light and cleared the codes and after 30 min of driving it was back on again. i stopped and had codes read and there were no codes stored but light was still on. now comes the fun part. there is a relay that controls the blower motor,dome light and radio power and it is freaking out. i hear it coming from under the dash somewhere behind the radio/ heater control panel but i cant seem to find it. am i going to have to tear out most of the dash to get to this relay?? I've also replaced the ignition switch already and it didn't help. there are no obvious wire damage and i have gone through and wiggled and disconnected ,reconnected all the harness plugs i can get to. this is driving me crazy and my new york inspection is due next month. i can find no help with the manuals i have and I've picked the brains of all i know about this. can anyone help with what seems to be a common problem with these trucks??? my thanks to all.
Last edited by 99f350superduty; Jan 5, 2010 at 02:31 PM. Reason: spelling
New User
Joined: Jul 2009
Posts: 2
Likes: 0
same thing here too
I was having the same problem too but intermitent but now the blower motor has stopped working had the dash all out traced wires checked fuses replaced relays and checked wires to make sure they were not burned thru or hada bad spot
what i have found the fuse in the cab fuse box for the blower motor was good but the wire from the fuse runs to the fuse box under the hood to a relay for the blower motor the non battery side of the interior fuse i checked the wire to the relay and had no complete circuit the wire had a bad spot in it or bad connection or there is another fuse relay or fusable link in it that i have not found everything else seems to be ok
tempoary fix for now the spot the relay plugs in has 4 female spade terminals the fuse in the cab trips the circuit/switch the aturns on the blower but there is power ther to go to the blower when the relay is not tripped ran a jumper wire from hot side o blower moto with a fuse on it but needs a switch on it as well so i can turn it off completely
yes i know its not the right fix but its 18 out
the fix hmm good question think i'm gonna have to run a new wire from the fuse in the cab to the relay under the hood unless i can find another relay or fusable link in there some where i can only imagine the fun it'll be to run the new wire be easier then to find the bad spot in the wire but what can you do
I'm interested in anyone elses find/fixes on this my truck isa 2000 f250 superduty ps
what i have found the fuse in the cab fuse box for the blower motor was good but the wire from the fuse runs to the fuse box under the hood to a relay for the blower motor the non battery side of the interior fuse i checked the wire to the relay and had no complete circuit the wire had a bad spot in it or bad connection or there is another fuse relay or fusable link in it that i have not found everything else seems to be ok
tempoary fix for now the spot the relay plugs in has 4 female spade terminals the fuse in the cab trips the circuit/switch the aturns on the blower but there is power ther to go to the blower when the relay is not tripped ran a jumper wire from hot side o blower moto with a fuse on it but needs a switch on it as well so i can turn it off completely
yes i know its not the right fix but its 18 out
the fix hmm good question think i'm gonna have to run a new wire from the fuse in the cab to the relay under the hood unless i can find another relay or fusable link in there some where i can only imagine the fun it'll be to run the new wire be easier then to find the bad spot in the wire but what can you do
I'm interested in anyone elses find/fixes on this my truck isa 2000 f250 superduty ps
Junior User
Joined: Jan 2010
Posts: 88
Likes: 0
ok this suck i start my new job Monday and this is what the new year starts out as
last night we went out to dinner and everything was fine. this morning i went to go into town and the truck was dead..."truck is a 99 f-250"we are talking not even a flicker of a dome light. i checked and the lights were turned off so i though i left the dome light or or something. i pulled up the car and hooked the jumper cables on and i herd the blower motor turn on and i had the keys in my hand
so i jumped the truck and let her run for 30 mins. i turned off the key and the blower motor was still on. you can turn it up and down and turn if off just like the key was on. i seen the air bag light was on to "the off light" and the abs unit was clicking on and off. the first thing i though was the ING switch went bad. it looked like it was the secondary ing that is on because the radio and other thing are not on. sooo i unpluged the ing switch and everything is still on so it's not that. i went around looking for a relay that was warm or clicking and nothing. i wiggled all the harnesses i could find thinking a wire rubbed through. i unplugged the abs unit and blower is still on. the only thing i have added on this truck is a cd player and trans temp gauge. i unplugged both of them. so i am thinking there must be a bcm or something giving power. i did unplug a box under the dash and that did nothing. so i need help because i dont want my baby to start on fire or something. i have the battery unhooked for the min
last night we went out to dinner and everything was fine. this morning i went to go into town and the truck was dead..."truck is a 99 f-250"we are talking not even a flicker of a dome light. i checked and the lights were turned off so i though i left the dome light or or something. i pulled up the car and hooked the jumper cables on and i herd the blower motor turn on and i had the keys in my hand
so i jumped the truck and let her run for 30 mins. i turned off the key and the blower motor was still on. you can turn it up and down and turn if off just like the key was on. i seen the air bag light was on to "the off light" and the abs unit was clicking on and off. the first thing i though was the ING switch went bad. it looked like it was the secondary ing that is on because the radio and other thing are not on. sooo i unpluged the ing switch and everything is still on so it's not that. i went around looking for a relay that was warm or clicking and nothing. i wiggled all the harnesses i could find thinking a wire rubbed through. i unplugged the abs unit and blower is still on. the only thing i have added on this truck is a cd player and trans temp gauge. i unplugged both of them. so i am thinking there must be a bcm or something giving power. i did unplug a box under the dash and that did nothing. so i need help because i dont want my baby to start on fire or something. i have the battery unhooked for the minNext, find that water leak and fix it, otherwise you will be in the same boat the next time moisture accumulates.
Junior User
Joined: Jan 2010
Posts: 88
Likes: 0
hi all, i recently started experiencing similar problems with my 99 f350 sd...
it started out with the airbag light and the control module beeping. then a series of clicking in the dash area. i noticed that my aftermarket radio wouldn't turn off and neither would the power to the windows and heater blower motor. this lasted for about 2 hrs then seemed to correct itself. all was good except for the window power not wanting to shut off, even with key removed and door open. Sunday after xmas i came out to find a stone cold dead battery, i replaced it as it was at least 3 yrs old and i didn't want to trust it anymore. all was good till i put in the new battery and found out the blower motor and interior light was freaking out, coming on and off by themselves. I've resolved myself to just make sure all was off when i shut the truck down for the night, and for a week all was good last Sunday my service engine soon light came on and the truck started shifting super hard, my buddy read the code and it was speed control sensor, no problem, $30 from ford and 15 min. later i was back in business. now comes today. i drove to work and while driving the airbag light came on again, and stayed on for 70 miles. i had someone read code and it was somthing like low voltage to control unit. i had 13.7 volts in the system so i couldn't understand why the code??? we reset the light and cleared the codes and after 30 min of driving it was back on again. i stopped and had codes read and there were no codes stored but light was still on. now comes the fun part. there is a relay that controls the blower motor,dome light and radio power and it is freaking out. i hear it coming from under the dash somewhere behind the radio/ heater control panel but i cant seem to find it. am i going to have to tear out most of the dash to get to this relay?? I've also replaced the ignition switch already and it didn't help. there are no obvious wire damage and i have gone through and wiggled and disconnected ,reconnected all the harness plugs i can get to. this is driving me crazy and my new york inspection is due next month. i can find no help with the manuals i have and I've picked the brains of all i know about this. can anyone help with what seems to be a common problem with these trucks??? my thanks to all.
it started out with the airbag light and the control module beeping. then a series of clicking in the dash area. i noticed that my aftermarket radio wouldn't turn off and neither would the power to the windows and heater blower motor. this lasted for about 2 hrs then seemed to correct itself. all was good except for the window power not wanting to shut off, even with key removed and door open. Sunday after xmas i came out to find a stone cold dead battery, i replaced it as it was at least 3 yrs old and i didn't want to trust it anymore. all was good till i put in the new battery and found out the blower motor and interior light was freaking out, coming on and off by themselves. I've resolved myself to just make sure all was off when i shut the truck down for the night, and for a week all was good last Sunday my service engine soon light came on and the truck started shifting super hard, my buddy read the code and it was speed control sensor, no problem, $30 from ford and 15 min. later i was back in business. now comes today. i drove to work and while driving the airbag light came on again, and stayed on for 70 miles. i had someone read code and it was somthing like low voltage to control unit. i had 13.7 volts in the system so i couldn't understand why the code??? we reset the light and cleared the codes and after 30 min of driving it was back on again. i stopped and had codes read and there were no codes stored but light was still on. now comes the fun part. there is a relay that controls the blower motor,dome light and radio power and it is freaking out. i hear it coming from under the dash somewhere behind the radio/ heater control panel but i cant seem to find it. am i going to have to tear out most of the dash to get to this relay?? I've also replaced the ignition switch already and it didn't help. there are no obvious wire damage and i have gone through and wiggled and disconnected ,reconnected all the harness plugs i can get to. this is driving me crazy and my new york inspection is due next month. i can find no help with the manuals i have and I've picked the brains of all i know about this. can anyone help with what seems to be a common problem with these trucks??? my thanks to all.
Thread Starter
|
Junior User
Joined: Jun 2009
Posts: 53
Likes: 0
yea i seen the 3 relays tucked back there. so far this hole week it has not done it. sucks because i dont trust it to much because it could just happen anytime. i checked over everything "it's not that cold here ha ha " and it looks fine. i dont have the water problem i have herd about. i dont know it's time to get my dully i want ha ha
New User
Joined: Jul 2009
Posts: 2
Likes: 0
I found the relays yes they are all the way in the back behind the radio up by the ductwork for the defrosters but did you see the other set of relays? they are just to the lfet of the steering column in behind the dash
i did however get a wring diagram of the fuse panels and wiring for the heat ac system and i still believe my proble is between the fuse under the dash i have power to it at both sides but according to my diagram the side that does not come off the battery goes to the fuse box under the hood to the relay that is for the blower motor i think i got a bad wire or connection in there someplace gonna check it again tuesday my diagram just shows that it goes from the fuse to the relay hope this fixes it it's too dang cold out to not have heat
i did however get a wring diagram of the fuse panels and wiring for the heat ac system and i still believe my proble is between the fuse under the dash i have power to it at both sides but according to my diagram the side that does not come off the battery goes to the fuse box under the hood to the relay that is for the blower motor i think i got a bad wire or connection in there someplace gonna check it again tuesday my diagram just shows that it goes from the fuse to the relay hope this fixes it it's too dang cold out to not have heat
Thread
Thread Starter
Forum
Replies
Last Post
MeHap
Explorer, Sport Trac, Mountaineer & Aviator
2
Dec 21, 2013 01:26 PM
Ogre39
1999 - 2003 7.3L Power Stroke Diesel
32
May 31, 2013 06:53 AM
snickerman
1997 - 2006 Expedition & Navigator
6
Feb 3, 2011 09:45 AM
ghig1967
1999 - 2003 7.3L Power Stroke Diesel
54
Mar 25, 2009 09:05 PM
