Wierd Electrical Short.

I keep blowing the HVAC control fuse. Today I took the whole dash apart looking for a shorted wire and could not find one.
But I did find some wierd issues. Here they are.

I noticed while I had the dash apart, that the fuse would not blow....so I did some more testing and found the short has something to do with the headlight switch or the associated wiring. As soon as I plug the headlight switch back into the harness, Bam the fuse blows.

I disconnected the HVAC control panel and the fuse still blew. So that eliminates a short inside the control.
Then only way I can make it not blow is to leave the headlight switch disconneted....not a good thing.

So what does the HVAC control and the headlight switch have in common?
95 model

Have you modified the wiring in any way?

Albertj

I have not...but I just bought the car....it appears it has has some electrical accessories added and removed at some time.

Just an added note. I was also have problem with the instrument panel lights....after many hours of work...I found very small bulb in the driver's door handle had the wires shorted together....I had hoped this would fix all the electrical issues...but did not correct the HVAC problem.....however, I do have dash lights again.

I would guess an aftermarket alarm system that was connected to the parking lights to make them flash. Alarm system removed... with a wire left dangling somewhere? Or a cut from a scotch-lock connecter now left exposed?

Good luck, chasing this type of problem can get very frustrating... Don't be discouraged.

Thanks for the reply. I was thinking the same thing....I just need to find a way to detect the short without using fuses....I have a pile of blown fuses on the floor under the car.

I was thinking of soldering some wires to a 12 light bulb and the plugging the ends of the wires into the fuse socket. Then the bulb will light up while the short is still there..and maybe as I fumble around I can make the light go off, that would give me some idea of where the short is.

I just wonder if the light bulb will act as a high amp fuse and thus causing the circuit to overload.

There is a short finder tool kit. Comes with a clicking circuit breaker and a gauge. Used to buy from snap-on or mac tools. I would check auto parts store or sears maybe cheaper.

in a old toyota that I had, there were wires touching behind the cd player and it cause the Hvac to stop working....

check for cd player wires touching any of the hvac stuff...

just an idea