light issues
Thread Starter
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New User
Joined: Oct 2009
Posts: 20
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From: Auburn, WA
light issues
Ok, here is the story, I have a 1977 Ford F150 Supercab Ranger that we got for free from the GF's dad....
the bad :lol:
both running lights work in the back, but the turn signals do diff things, aka the left one - the running light flashes when the signal is on and on the right the running light stays lit and the second filiment flashes. the brake lights do not work and the hazard lights do not work.
her dad had a trailer brake system and a battery isolator and some :custom: wiring that i removed cause NONE of it worked. so now we are pretty much back to what it should be stock.
I dont have the money for a new wiring harness..although i wish i did, so if anyone knows of a place to get one cheap let me know haha
i did check and fix the rear grounds, new screws, sanded down to bare metal where it seats and i checked ground continuity and it is fine
does anyone have any tips, suggestions, war stories from similar models, wiring diagrams, etc that would help me?
Thank you soooo much!!!!!
the bad :lol:
both running lights work in the back, but the turn signals do diff things, aka the left one - the running light flashes when the signal is on and on the right the running light stays lit and the second filiment flashes. the brake lights do not work and the hazard lights do not work.
her dad had a trailer brake system and a battery isolator and some :custom: wiring that i removed cause NONE of it worked. so now we are pretty much back to what it should be stock.
I dont have the money for a new wiring harness..although i wish i did, so if anyone knows of a place to get one cheap let me know haha
i did check and fix the rear grounds, new screws, sanded down to bare metal where it seats and i checked ground continuity and it is fine
does anyone have any tips, suggestions, war stories from similar models, wiring diagrams, etc that would help me?
Thank you soooo much!!!!!
Moderator
Joined: Jan 2001
Posts: 57,025
Likes: 2,756
From: Virginia
I would start up front with the brake wiring. First get a testlight or voltmeter(testlight would be best actually). Make sure you have 12v on one side of the brake switch on the pedal arm, and you should have 12v on the other side of the switch when you push the pedal.
If you have 12v coming out of the brake switch when the pedal is pushed, make note the color of this wire, and then look for it at the turnsignal switch. You will need to pull the steering wheel and probe the turnsignal switch.
With the turnsignal switch in the middle position, you should have 12v coming in on one wire, and 12v going out on two wires at the turnsignal switch when the brake pedal is pushed.
According to the diagram I have;
Going into the brake switch should be red, going out should be red/black.
So going into the turnsignal switch should be a red/black, and coming out should be a green(going to the right rear light) and a yellow/black or a lightblue/black (crappy diagram) to the left rear light.
If you don't get voltage coming out of the turnsignal switch, the switch is probably bad.
If you have 12v coming out of the brake switch when the pedal is pushed, make note the color of this wire, and then look for it at the turnsignal switch. You will need to pull the steering wheel and probe the turnsignal switch.
With the turnsignal switch in the middle position, you should have 12v coming in on one wire, and 12v going out on two wires at the turnsignal switch when the brake pedal is pushed.
According to the diagram I have;
Going into the brake switch should be red, going out should be red/black.
So going into the turnsignal switch should be a red/black, and coming out should be a green(going to the right rear light) and a yellow/black or a lightblue/black (crappy diagram) to the left rear light.
If you don't get voltage coming out of the turnsignal switch, the switch is probably bad.
Thread Starter
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New User
Joined: Oct 2009
Posts: 20
Likes: 0
From: Auburn, WA
awesome, i will have to take a look at that! now, here is a question. if my flashers work, wont that mean that i am getting power out on those wires cause it will use the same wires from the blinker switch to the light and mena that my problem is before the blinkers?
Moderator
Joined: Jan 2001
Posts: 57,025
Likes: 2,756
From: Virginia
I am not sure about your year, but a lot of the older trucks have a separate 4-way flasher switch. Later on they integrated the 4 way switch into the turnsignal switch as one piece. But it's still a separate part of the switch, and the turnsignal part could still be bad. You are correct though, that's some confirmation that the wiring to the rear may be good.
