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Short in the headlight wiring triggering, or ???

944 Views 3 Replies 2 Participants Last post by  Steve83
Ok, well im looking at buying a 1990 Bronco 302, aod. Theres some problem on it that makes the headlights/interior lights go on and off randomly.

PO said:
Ok well heres the deal. Not to long ago my headlights and interior lights started to randomly go off and on when I would have my headlights on at night. I'd be driving down the road and randomly they would turn off for a few seconds and then come back on, which is not cool at all, especially because I live in bumf$%^ with streets that have no lighting on them. I've done a search to see what could possibly be the problem but havent found anything that really sounds related. Anyone have any ideas???
:banghead
There is the problem the owner posted.


Steve says it is this in response to his post
Steve83 said:
You either have a short in the headlight wiring triggering the H/L switch's internal circuit breaker, or the H/L switch terminals are burning.
To fix it, suspect for shorts - visual inspection followed by diagnosis with a meter &/or test light.

Typically, you'd start by disconnecting the circuit, but in this particular case, it's a lot of work to get to the headlight switch connector, so I'd put that off until I had checked some easier stuff.

Most of this covered in Haynes in the last chapter.
Steve83 said:
It's very rare for that design of Ford headlight switch to go bad - it's the connector terminals, on your wiring harness. Did you inspect them when you changed the switch? Otherwise, it's a short under the hood tripping the switch's CB.

The owner shows me this box looking thing with a bunch of copper plugs on one side of it, and says they are either bad or the thing that it plugs into. The box is behind the headlight switch. I think atleast.

Is changing the connector terminals hard, aent they connected to the harness? Im very confused when it comes to electronics, especially since I never did anything like this. How hard is this? Iam getting over my head? Has anyone else did this before? I searched but never got exactly what I posted. If you remember the wording of a thread with this same question let me know.






Here is the thread, you will probably have to read this to understand what im talking about.
http://fullsizebronco.com/forum/showthread.php?t=65899
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lol, my manual is in another state. So I did NOTHING, lol!:toothless

I cant tear the guys dash apart, im just looking to buy it. Im trying to deciede if I should buy it with this problem.
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