Bad Stop light?(brake light) - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-07-2006, 08:22 PM
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Bad Stop light?(brake light)

I have a situation in my '72 pontiac where I think my stop light switch is bad.

I checked the fuse that handles both the stop lights and the hazards, and it is not blown. Incidentally, only the front flashers work when I turn on the flashers.

The taillights are working as well. Does this condtion indeed reflect a bad stop light switch?

Okay, I went out and did a test. I ran out and got another stop light switch, albeit this one that is for cars that have cruise control as well.

I turn the blinkers on. When the button on the switch was depressed (=no brakes applied) the front flashers worked, but still no tail lights. When the button was released (= brakes applied) the front flashers stopped working.

Even though the test switch is for a cruise control car, I think this test tells me there is some problem in the stop wiring to the rear lights. I checked to see all the connections were good. What is going on here?

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Old 03-07-2006, 11:11 PM
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Power for your stoplights go from the stoplight sw. up to the turn signal sw. then to the tail lights. If you have a volt meter or test light, that's were I'd start looking.
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Old 03-08-2006, 06:46 AM
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The rest of the story

Okay, so I omitted some stuff, didnt think they were connected, and I thought it would muddy my original question.

I have had a turn signal light that does not come on one side. I have had to manually move the turn signal lever up and down on the left side, because when I put the lever all the way down, the turn signal lights just stay on and wont 'click'. The right side turn signal works fine. I just figured I had a bad ground on the one left side bulb, and assumed my brake lights had been working the whole time... maybe not, eh?
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Old 03-08-2006, 11:04 AM
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First thing to do is make sure all the bulbs are good.

Then check for bad grounds at the bulb sockets.

But, from the symptoms, it's probably a bad turn signal switch.

The brake light circuit goes thru the T.S. switch (left rear and right rear) when it's centered.

The attached sketch shows the circuiting and switching of the T.S. switch, the hazard switch and the brake light switch.

vicrod
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Old 03-08-2006, 06:33 PM
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"vicrod' gave you a good wiring diagram.

Looks like the next step is to replace the T/S sw. The hardest part is getting the steering wheel off. You can pick up an inexpensive steering wheel puller at most auto parts stores.
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Old 03-08-2006, 10:38 PM
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Doc here,

Check the plug at the bottom of the steering column for loose or dirty connections.

If you can, Isolate the inputs (flasher, brake lamps, tails) and the cooresponding output, and jumper them one at a time and check for proper operation, this will bypass the switch, and either include or exclude it before having to pull the wheel.

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Old 03-09-2006, 08:21 AM
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Houston, no more problem.

Thanks, y'all! Problem is solved. I just decided to pull the wheel and dive in.

It wasnt till I was into it, that I figured I actually needed two different types of pullers. The second one was actually more of a "pusher" That pushes the lock ring away from the snap ring on the shaft.

I was lucky to score a NOS AC Delco replacement T.S. switch that was at least 15 years old. It had been sitting around way back on a forgotten shelf in its beat-up old-school AC Delco box just waiting for someday that I walked in to claim it!

Thanks for posting diagrams and advice.

I also found that I had a loose bulb in the back, and that replacing it fixed my turn signal problem as well.

YAYYYY!!!
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Old 03-09-2006, 04:19 PM
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Doc Here,

Big time Score Man!

Glad to hear you got 'er Done, And Thanks for posting back and letting us know the fix, It may help someone else down the road..

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