77 f150 blinker help
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Joined: Nov 2003
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From: Buckner, KY
77 f150 blinker help
1977 f150 blinker help
I searched the old forums and tried some stuff but still need help. I posted this in the truck forum but is probally better to post it here. Here is what i have.
Problem = right blinker not working with lights on
I will start with my current situation.
With the ignition and lights off my hazard lights work properly. With my ignition on my hazard lights work properly. IF you turn on the headlights both hazard lights do not work...they are off and stay off.
When the truck is running with the lights off the blinkers work properly. Truck running with lights on and the left blinker works but the right blinker does not (stays on).
What i have done. Replaced the right rear tail light/blinker socket and cleaned the grounds. I do not think there was anything wrong with it as after i replaced it i tested the old one and it was not shorted. Replaced the right front blinker socket. The socket was shorted. I think there may be a issues here..... i took of the socket and disconected the battery and the 2 hot leads were shorted. So i took apart the driver side to compare. The driver side is shorted to but works. I replaced the left front socket and both the blinker filamant and light filament are always on. I believe this is the issue but am not sure what is causing it.
I then ripped apart the dash and removed the headlight switch. I just am not sure how to test it or verify that my problem is coming from this or ?
well, i got my wiring diagram out and test the turn signal switch as follows. according to my test the turn signal switch is operating properly...does this sound correct?
I disconnected the battery and unhooked the turn signal switch connector from the bottom of the steering wheel shaft.
I had everything off, no hazards turn signal switch in the center and nothing was shorted. i tested each terminal.
I turned the hazards on and the yel/black (left rear), green (right rear), green/white (left front) white/blue (right front) and the hazard flasher (white/red) were all shorted. I believe this to be correct as all 4 lights should get voltage when the hazards are on. no other terminals showed continuity.
I then turned the right blinker on and the green (right rear), white /blue (right front) and the directional flasher terminal (blue) and were shorted. Again i think this is correct.
I then turned the left blinker on and the yellow/black and green/white (left rear and left front) and the directional flasher terminal (blue) and were shorted. Again i think this is correct.
Does this sound correct. I do not think my problem is the turn signal switch.
Am i a idiot or am i doing something wrong
Also,
I went ahead and replaced the headlight switch and the hazards work now with the ignition on.
My right blinker still is the same....stays on when the lights are on and does not blink.
Still working on this......
I took every bulb out of the right hand side. Removed the front park light on the side, front turn indicator bulb and rear side park and the 2 rear lights.
I tried turning the right blinker on and it still stayed on (note: it is on but is dim (like something is shorted).
I then cut the front turn signal socket out and tried it again. same thing. no change. I then cut the rear signal socket out. same thing.
With all this removed should the indicator light stay on still. Not sure if i proved anything or not just trying to fix this stupid thing.
I searched the old forums and tried some stuff but still need help. I posted this in the truck forum but is probally better to post it here. Here is what i have.
Problem = right blinker not working with lights on
I will start with my current situation.
With the ignition and lights off my hazard lights work properly. With my ignition on my hazard lights work properly. IF you turn on the headlights both hazard lights do not work...they are off and stay off.
When the truck is running with the lights off the blinkers work properly. Truck running with lights on and the left blinker works but the right blinker does not (stays on).
What i have done. Replaced the right rear tail light/blinker socket and cleaned the grounds. I do not think there was anything wrong with it as after i replaced it i tested the old one and it was not shorted. Replaced the right front blinker socket. The socket was shorted. I think there may be a issues here..... i took of the socket and disconected the battery and the 2 hot leads were shorted. So i took apart the driver side to compare. The driver side is shorted to but works. I replaced the left front socket and both the blinker filamant and light filament are always on. I believe this is the issue but am not sure what is causing it.
I then ripped apart the dash and removed the headlight switch. I just am not sure how to test it or verify that my problem is coming from this or ?
well, i got my wiring diagram out and test the turn signal switch as follows. according to my test the turn signal switch is operating properly...does this sound correct?
I disconnected the battery and unhooked the turn signal switch connector from the bottom of the steering wheel shaft.
I had everything off, no hazards turn signal switch in the center and nothing was shorted. i tested each terminal.
I turned the hazards on and the yel/black (left rear), green (right rear), green/white (left front) white/blue (right front) and the hazard flasher (white/red) were all shorted. I believe this to be correct as all 4 lights should get voltage when the hazards are on. no other terminals showed continuity.
I then turned the right blinker on and the green (right rear), white /blue (right front) and the directional flasher terminal (blue) and were shorted. Again i think this is correct.
I then turned the left blinker on and the yellow/black and green/white (left rear and left front) and the directional flasher terminal (blue) and were shorted. Again i think this is correct.
Does this sound correct. I do not think my problem is the turn signal switch.
Am i a idiot or am i doing something wrong
Also,
I went ahead and replaced the headlight switch and the hazards work now with the ignition on.
My right blinker still is the same....stays on when the lights are on and does not blink.
Still working on this......
I took every bulb out of the right hand side. Removed the front park light on the side, front turn indicator bulb and rear side park and the 2 rear lights.
I tried turning the right blinker on and it still stayed on (note: it is on but is dim (like something is shorted).
I then cut the front turn signal socket out and tried it again. same thing. no change. I then cut the rear signal socket out. same thing.
With all this removed should the indicator light stay on still. Not sure if i proved anything or not just trying to fix this stupid thing.
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Joined: Jan 2001
Posts: 57,025
Likes: 2,756
From: Virginia
The flasher works on the load of the bulbs hooked to it. They have it calibrated pretty close, so if you don't have all the bulbs in the circuit and working, then the flasher will not flash.
This is a common problem you have. 99% of the time the problem will be a bad ground in the front right socket. The ground is the brass part of the bulb, and the little tang on the socket that contacts it. Since you have a new socket and a new bulb, then the next place to look is the ground connection in the harness for the socket. If the ground wire looks good, then it may be a rust problem were the ground is bolted to the front body area.
I see you are into testing things(that's good) so if you want to test this ground theory, get everything hooked back up, and have the front right bulb and socket out where you can do some testing. Get a piece of scrap wire and hook it to the battery ground terminal. Then get the right signal going, turn the headlights on so it stops blinking, and then take the scrap piece of wire hooked to the battery - and jamb it down beside the bulb so it touches the brass part of the bulb. If it sudden starts blinking when the battery - wire touches the outside part of the bulb, then you have found the problem.
This is a common problem you have. 99% of the time the problem will be a bad ground in the front right socket. The ground is the brass part of the bulb, and the little tang on the socket that contacts it. Since you have a new socket and a new bulb, then the next place to look is the ground connection in the harness for the socket. If the ground wire looks good, then it may be a rust problem were the ground is bolted to the front body area.
I see you are into testing things(that's good) so if you want to test this ground theory, get everything hooked back up, and have the front right bulb and socket out where you can do some testing. Get a piece of scrap wire and hook it to the battery ground terminal. Then get the right signal going, turn the headlights on so it stops blinking, and then take the scrap piece of wire hooked to the battery - and jamb it down beside the bulb so it touches the brass part of the bulb. If it sudden starts blinking when the battery - wire touches the outside part of the bulb, then you have found the problem.
