No trailer marker lights when plugged in
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No trailer marker lights when plugged in
When my trailer plug is plugged in I have now marker lights. When it is unplugged it works fine with the test light until i plug the trailer back in. What gives here. I completly rewired the trailer with new wire and connectors. STill i have the same thing. I dont know what else to do here
Postmaster
Joined: Nov 2004
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From: New Hampshire
what year is your truck... the newer psds have a seperate circut for the trailer... it doesn't effect your trucks lights at all.... sounds to me like something got cross wired or is shorting on something else... the problem with the test light is it only powers one wire at a time... if one wire is shorting out another... it can be a bear to trace...
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what year is my truck
I have a 2000 f250 super duty 4x4. As i said everything else works fine just when the trailer is plugged in i have no marker lights. But everything else works. Its driving me totaly nutts
Posting Guru
Joined: Aug 2004
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From: Braham MN
First, what type of plug is it, 4, 6, or 7 prong plug.
Sounds like a couple of things, like a bad ground from the trailer to the truck, and that somethings is back feeding if its a 6 or 7 prong. like the power wire is back feeding to the runnings lights wire, causing them to shut off.
I had one a few weeks ago with a bad ground and everytime I hit my blinker it would back feed throught the brake circuit and kick off my T/C lock, I could watch the L.E.D. blink on and off with the blinker. bad grounds do REALLY weird things.
Diesel Rod
Sounds like a couple of things, like a bad ground from the trailer to the truck, and that somethings is back feeding if its a 6 or 7 prong. like the power wire is back feeding to the runnings lights wire, causing them to shut off.
I had one a few weeks ago with a bad ground and everytime I hit my blinker it would back feed throught the brake circuit and kick off my T/C lock, I could watch the L.E.D. blink on and off with the blinker. bad grounds do REALLY weird things.
Diesel Rod
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lights
Actually when i plug the trailer into the truck I dont have marker lights. Its like a relay cuts off. I got past that point . Now i dont have a left signal on the trailer. At the plug on the truck it works until i plug the trailer into the plug then within 3 sec. the trailer signal quits but the truck still works. Its like something is getting hot and cutting off until i unplug the trailer then it works again. The r side works like a dream. The only way i got the marker lights to work is to connect the wire to the battery pin on the back of the truck. They will not work if connected to the proper pin.
I think its a relay problem but not sure i dont have a manual
I think its a relay problem but not sure i dont have a manual
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Joined: Aug 2004
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From: Braham MN
When you hooked the trailer lights to the battery plug did everything else work??? or did your left signal quit then???
Just trying to figure out if its the truck or trailer, sounds like its the truck. it really baffles me that your getting power at the truck then not after 3 seconds.
It does sound like a relay problem. try switching the relay with another and see if that helps.
These things are real hard to diagnose over the computer, alot easier when you can test it in person.
Diesel Rod
Just trying to figure out if its the truck or trailer, sounds like its the truck. it really baffles me that your getting power at the truck then not after 3 seconds.
It does sound like a relay problem. try switching the relay with another and see if that helps.
These things are real hard to diagnose over the computer, alot easier when you can test it in person.
Diesel Rod
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Postmaster
Joined: Nov 2004
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From: New Hampshire
i know this is unrelated, but when i hooked up the speaker on a new home stereo i would get sound for about three seconds then it would shut off... what had happened was that the two wires pluged into the back of the amp that went to the center channel speaker were crossed and shorting out that channel... the amp obviously have a safety built in that shut it down when it sensed the shorted condition.. i am wondering if maybe you have two wires shorting out on your trailer and your truck is sensing the short and a relay IS shutting down the power to that circut...
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