Chevy S10 electrical question

So it is as if the brake pedal is always pressed in?

Might want to check the brake pedal brake light switch. Be aware that there may be two or more switches which go to different things on the brake pedal. Such as the "curse control". (I need one of those! :-) )

Yes, it's like the break light is always on.

I only found the one switch, which has six wires going to it. I opened the case of the switch and found 3 individual, reed type like in a relay, sub-switches inside the case. Two normally opened and one normally closed contact. If there is another switch then I have not found it yet and the Haynes manual is very little help.

I would say either your MFS is bad in your steering wheel, or your harness has a short somewhere.

If you pull the harness to the MFS and the light is still on, your wire harness somewhere has a short. Your almost going to need factory wiring diagrams or a lot of luck to figure that out. look for things that look burnt or warped.

bob

bob

Actually there are closer to 14 fuses involving those lights!

Probably the multi-function switch in the column. Stop lamp fuse sends power up through the switch and out to the lights through the brake switch. It also can short internally and send power to the lights like you were turning on the 4 way flashers. BUT because of the short they won't flash because the flasher is not in circuit.

You can get a GM factory service manual set at helminc.com. The complete set of books comes with electrical diagrams for *everything*.

Thanks bob, bill and steve for the replies so far.

The MFS is something I was thinking about a couple of days ago. I will look into the steering column today to see how hard the MFS is to get at. Yes, I know not to mess with any yellow wires which connect to the air bag.

The short answer is It's a BIT%^ to get at....

The easy answer (and cheaper as well) Go to car-Part.com. Find a yard near you that has a complete column in the proper color and swap the entire thing. Cheaper, faster and FAR FAR easier....

Hi!

That last option intrigues me. ;-)

Many of the lights are controlled by relay, so you could have a relay that's sticking.

But you might also want to make sure the lights are properly grounded. Messed up grounds will cause bad electrical behavior, and the ground for these lights is subject to rust or degradation.

William

Thanks William, I've checked some of the ground points that I could find. I'm not sure which relay would control the lights since none are shown in the Haynes manual or inside the cover of the fuse block, however, much of the truck is a little different than the manual so there could very likely be a relay in the circut some place.

Yes, it has "curse" control, I got that aftermarket, to keep the kids from using bad words. It also has cruse control.

Thanks

Did you make sure that the brake peddle lets the switch button come out....sometimes they can hold the button in.I 've had that happen a few times before. Bobby

Yes, I actually removed the switch from the truck, still the lights would not go out. I even connected the switch to the circuit with the switch opened up so that I could see the contacts and manually open and close them, still the lights would not go out.

I'm starting to think it is about time to take a trip to the mechanic.

Thanks

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--------------------- One place to pay close attention to for chafed wires is where the wirebundle runs between the gas tank and the bottom of the truck bed.

I had a fuel pump changed a while back, and the mechanic wound up chasing a tail light and blinker problem for 2 or 3 days.

HTH, Mark