Ground Issues: marker lights, parking lamps and tail lamps always on - Team Camaro Tech
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post #1 of 10 (permalink) Old Dec 21st, 12, 07:06 AM Thread Starter
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Ground Issues: marker lights, parking lamps and tail lamps always on

68 Camaro
New headlight harness
New taillight harness
New horn relay
New voltage regulator
New battery cables

With the battery connected, the marker lamps, parking lamps and tail lights are all on.

This didn't happen before I disassembled the dash and got my RS headlights working.

The headlight harness has 2 grounds by each of the headlights. On the PS this is connected to the front of radiator support.

The ground connection from the battery is connected to the inside ledge of the fender.

The DS headlight ground is connected to the back of the radiator support with the ground wire from the voltage regulator.

Is there anything I'm missing here? I don't think it's anything with the rear tail lights because they haven't been touched.

I do have all of the dash switches disconnected. Do they somehow ground the system through the metal dash?

Jason
2009 CTS-V - 1968 Camaro 327/M20 Sequoia Green
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post #2 of 10 (permalink) Old Dec 21st, 12, 10:05 AM
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Re: Ground Issues: marker lights, parking lamps and tail lamps always

Headlamp switch has no ground connection to the dash, the switch justs distributes battery power to the various bulbs.
If you did not change the rear light harness, what did you change for the taillight harness?
I read it as you changed the headlamp harness in the engine compartment.
This harness mates with the dash harness.
I would wager there is a miswire from the new harness to the old harness, including the rear taillight harness.
Get the older harness and compare wire colors.

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post #3 of 10 (permalink) Old Dec 21st, 12, 11:03 AM Thread Starter
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Re: Ground Issues: marker lights, parking lamps and tail lamps always

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Originally Posted by Everett#2390 View Post
If you did not change the rear light harness, what did you change for the taillight harness?
Sorry it was a bit hard to explain. The taillight harness is new, but after it was changed there weren't any issues. It hasn't been changed or touched since then, only thing that has changed is me messing with the front end wiring.

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post #4 of 10 (permalink) Old Dec 21st, 12, 11:11 AM
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Re: Ground Issues: marker lights, parking lamps and tail lamps always

Doesn't sound like a ground issue... If you have all the dash switches disconnected there should be no power getting to any of the lights. Start at the parking lamps and trace the positive leads backwards until you find where the positive potential is coming from. It may lead you right to a harness connector as Everett suggests.

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post #5 of 10 (permalink) Old Dec 21st, 12, 11:34 AM Thread Starter
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Re: Ground Issues: marker lights, parking lamps and tail lamps always

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Originally Posted by DjD View Post
Doesn't sound like a ground issue... If you have all the dash switches disconnected there should be no power getting to any of the lights. Start at the parking lamps and trace the positive leads backwards until you find where the positive potential is coming from. It may lead you right to a harness connector as Everett suggests.
By disconnected, I meant removed from the dash. They're still plugged in physically to the wiring.

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post #6 of 10 (permalink) Old Dec 21st, 12, 11:48 AM
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Re: Ground Issues: marker lights, parking lamps and tail lamps always

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Originally Posted by blue89bird View Post
By disconnected, I meant removed from the dash. They're still plugged in physically to the wiring.
Start be unplugging the harness from the light switch then. If there is a short in the switch the bulbs will go out. If they don't go out, check the firewall connector for a mismatch in the connector.

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post #7 of 10 (permalink) Old Dec 21st, 12, 12:07 PM Thread Starter
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Re: Ground Issues: marker lights, parking lamps and tail lamps always

I'm actually embarrassed to admit this...

The switch wasn't pushed in all the way. The little collar that sits around the front of the switch was stopping it from going in all the way. I was tracing a problem I didn't have.

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post #8 of 10 (permalink) Old Dec 21st, 12, 12:16 PM
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Re: Ground Issues: marker lights, parking lamps and tail lamps always

Happens to everybody.

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post #9 of 10 (permalink) Old Dec 21st, 12, 12:19 PM
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Re: Ground Issues: marker lights, parking lamps and tail lamps always


...Dennis

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post #10 of 10 (permalink) Old Dec 21st, 12, 01:42 PM
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Re: Ground Issues: marker lights, parking lamps and tail lamps always

Cool! It would be nice if all problems were this simple.

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