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Old 04-04-2009, 10:39 PM
chewyscool's Avatar
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Help with tail/brake lights needed!

I was testing my new wiring and ran into a problem with the tail lights. I was hoping that maybe someone can look at how I have it wired and see if something is wrong. First let me tell you what is going on:

-all lights and signals up front are working properly
-when the running lights or lights are turned on it seems that the brake lights
are on, taillights very bright, no brake light when applied and no signal
when applied.
-when lights are off signals work, and brake lights when applied are dim as if
they are the running lights.

all the switches are new and I tried the old one as well because it did work right when I took it out, but I get the same problem as above which leads me to think I have it wired incorrectly. Please take a look at the diagram I drew and see if you can find an answer.......... Thanks

oh yea, gm wiring and a 1 socket/bulb for all 3 uses running, signal, and brake.
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Last edited by chewyscool; 04-04-2009 at 11:02 PM.
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Old 04-04-2009, 11:10 PM
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it sure sounds like you have the wrong bulbs in the back. i don't remember the numbers (maybe 1034s and 1157s) have the brake and tail filiments on the opposite contacts on the bulb. thus the brake and tail lights will be switched, giving the symptoms you describe.
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Old 04-04-2009, 11:18 PM
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The running lights should come from the headlight switch, and the brake/turn light comes from the brake switch, and the turn signal switch, through the flasher.

You cannot make all 3 light functions work with a single element bulb.
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Old 04-04-2009, 11:29 PM
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If you have the correct bulbs in (1157?) which should be double element/contact, and your sockets should be double contact, it sounds like you may have the turn signal switch wired incorrectly.
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Old 04-04-2009, 11:32 PM
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need 1157 two-filament bulbs to do these three functions yes

brake and turn on the thinner filament

and parking on the thicker filament

ground on the outside casing of the socket

brown is tail and license plate light and sidemarkers


yellow and light green are the left and right stop/turn


on the GM vehicles anyways
make sure grounds are good and strong

too much ground is impossible

ground, ground, ground, more the better! make sure all metal parts and sockets are grounded to the frame and body really super good or some or all lights will be dim
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Old 04-04-2009, 11:34 PM
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Quote:
Originally Posted by carsavvycook
The running lights should come from the headlight switch, and the brake/turn light comes from the brake switch, and the turn signal switch, through the flasher.

You cannot make all 3 light functions work with a single element bulb.
hi carsavvy, as i read it he is useing a single bulb/ socket in the back, not necessarily a single element bulb. if he installs the wrong bulb in the socket the brake light filiment will overwhelm the tail light filiment and he will get exactly the symptoms he is describing. i have corrected this problem for "know nots" many times by just installing the correct bulbs.
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Old 04-04-2009, 11:52 PM
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Quote:
Originally Posted by techron
hi carsavvy, as i read it he is useing a single bulb/ socket in the back, not necessarily a single element bulb. if he installs the wrong bulb in the socket the brake light filiment will overwhelm the tail light filiment and he will get exactly the symptoms he is describing. i have corrected this problem for "know nots" many times by just installing the correct bulbs.
I've seen it/ fixed it before, but I like to give the benefit of the doubt. I dislike thinking anyone makes this type of mistake coherent.

Hey at least we all did'nt blow a fuse yet
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Old 04-05-2009, 08:38 AM
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I was thinking that I may have the wires crossed at the socket, and will switch them up today. It is a 1157 bulb and socket that has 2 black wires that I have made my green/yellow and brown connections to. Very well could have crossed them.
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