2000 Ford F-150 electrical problems

JOHNGLASS

MEMBER
2000 FORD F-150
174,000 MILES

When I turn on the headlights or heater/ac the turn signal indicator lights and high beem indicator light comes on. But the heater/ac does not work and when this happens my turn signals and hazard lights don't work. I've been to the dealer and they have never heard of this but will say it's an electrical problem. Any ideas?

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

My guess is there is a ground issue happening. When this happens, if the ground is bad, power will back feed it's way through a different circuit. In this case, it is going through the signal/high beam circuit and causing the lights to come on. Check body grounds to confirm they are all good.

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Sunday, July 7th, 2013 AT 7:48 PM

JOHNGLASS

MEMBER
3 POSTS

Thanks I will double check them I have check for a few of them I will look again

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Monday, July 8th, 2013 AT 2:19 AM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

I don't know why, but this just showed up in my mail. Sorry it has been so long. Have you had any luck with the issue?

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Saturday, August 10th, 2013 AT 9:36 PM

JOHNGLASS

MEMBER
3 POSTS

I have replaced the drivers window switch it seems to have really helped a lot but there is still some issues were there for electric is not working correctly like the up button on the passenger window now sometimes makes the drivers window go down when it gets all the way up but I feel as if I am on the right track thanks for your help

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Sunday, August 11th, 2013 AT 5:11 AM

JACOBANDNICKOLAS