Electrical Problem
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Mountain Pass
Joined: Feb 2000
Posts: 120
Likes: 2
From: PA
Electrical Problem
I have a 1985 F-150 short-bed with 300 six and 3 speed with overdrive. When I turn a turn signal on with the parking or headlights on, the opposite side's light will vary intensity in unison with the turn signal on the rear only. Turn signal on, opposite light will dim, slightly. Backup lights will do the same, except both sides do this.
I have checked grounds at the rear and they are good. I redid the splice for the ground at the rear of the truck. I have replaced the light switch, because with everything shut off on the truck, I was seeing a closed circuit at the rear disconnect for the parking lights. Thought this was the problem, but still have it with new switch. Tried all new bulbs, no difference. Ran a wire from the - terminal of the battery to the ground wire at the rear of the truck, no difference. Tried a new flasher, no difference. Cleaned the common ground beside the radio in the dash, no difference. What have I missed?
I have checked grounds at the rear and they are good. I redid the splice for the ground at the rear of the truck. I have replaced the light switch, because with everything shut off on the truck, I was seeing a closed circuit at the rear disconnect for the parking lights. Thought this was the problem, but still have it with new switch. Tried all new bulbs, no difference. Ran a wire from the - terminal of the battery to the ground wire at the rear of the truck, no difference. Tried a new flasher, no difference. Cleaned the common ground beside the radio in the dash, no difference. What have I missed?
Senior User
Joined: Aug 2006
Posts: 113
Likes: 2
From: Texas
Have you checked you emergency flasher? If the flasher is burned out, or otherwise out of comission, and the button is left in, it will do weird things to the rest of the system. I had something very similar happen in a ford FE. Pulled out a lot of hair before I figured it out. I don't know if the 85 ford is wired similarly, but it wouldn't hurt to check it out.
Thread Starter
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Mountain Pass
Joined: Feb 2000
Posts: 120
Likes: 2
From: PA
I assume you are referring to what I call the 4-ways? Yes they work and that will cause the same thing to happen if I have the backup lights on. Is there some way that the turn signals are drawing too much current and making the other lights seem to dim?
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