Tail lights and blinkers - somethings weird - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 10 (permalink) Old Aug 1st, 16, 11:11 PM Thread Starter
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Question Tail lights and blinkers - somethings weird

I'm wiring up my new American auto wire harness and circuits in my 66. I'm working on the rear lights circuit and it's behaving bizarre, or seems that way to me.

With the rear lights and bulbs plugged in, both the right and left bulbs turn on. But my lights are turned on! When I unplug my brake light switch, the lights turn off (it's a new switch that is also NOT connected to the pedal). When I plug the ores back into the switch, the lights turn back on. When I press the button, the lights run off. Also when I turn the blinkers on, the rear lights blink correctly. However when the light switch is turned on, the rear lights don't blink and instead stay on...

I'm a bit confused as to what I'm missing or what might be goofed.
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post #2 of 10 (permalink) Old Aug 2nd, 16, 7:55 AM
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Re: Tail lights and blinkers - somethings weird

I suggest you call the AAW tech support line. You have something hooked up wrong. But from your description, it's hard to tell just what's wrong.

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post #3 of 10 (permalink) Old Aug 2nd, 16, 9:03 AM
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Re: Tail lights and blinkers - somethings weird

first thought is that the brake switch is on. not sure what you mean by not connected to the pedal. the normal brake switch mounted above the pedal arm turns the light on when the plunger is out and lights go off when the pedal arm comes up and depresses the switch plunger.

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post #4 of 10 (permalink) Old Aug 2nd, 16, 10:24 AM
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Re: Tail lights and blinkers - somethings weird

The brake light/turn signal filament side of the rear bulbs should be on if the brake light switch is not "connected to the pedal"
Sounds like maybe more than one problem.

Make sure that the bulb sockets have good grounds.
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post #5 of 10 (permalink) Old Aug 2nd, 16, 6:19 PM Thread Starter
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Re: Tail lights and blinkers - somethings weird

Sorry many ways to try and explain lol.

Yes, I removed the button/plunger that turns the brakes lights on as you press the pedal, therefore ruling out the brake pedal touching the plunger. When I press the plunger in, the lights turn off. When I let go, they turn on even if I don't have the headlight switch turned on or anything.

Curiously, if I disconnect the blinker circuit from the steering wheel, the tail lights don't turn on at all even when I use the light switch or press the plunger thingy

I'll call aaw
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post #6 of 10 (permalink) Old Aug 2nd, 16, 6:20 PM Thread Starter
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Re: Tail lights and blinkers - somethings weird

Curiously, I have my light switch dangling from the circuit as I've yet to instal it into the dash. Could this be a contributing factor somehow?
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post #7 of 10 (permalink) Old Aug 2nd, 16, 6:46 PM Thread Starter
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Re: Tail lights and blinkers - somethings weird

Quote:
The brake light/turn signal filament side of the rear bulbs should be on if the brake light switch is not "connected to the pedal"
Sounds like maybe more than one problem.

Make sure that the bulb sockets have good grounds.
Both were it^

Wow this wiring business is pretty interesting.

So I plugged the rear sockets into the actual uh light enclosures. Once plugged in, everything worked correctly... So the sockets needed to be grounded? (Yet the lights were turning on when just dangling in my hand) I've been testing everything without actually plugging things into the reciptacles thinking I was being extra thorough as I was hoping to catch problems before its all completely installed and buttoned up. Guess not

And my issue with the brake button -- I was just getting it confused when the button is pressed in, the brakes lights are off, when the button is depressed the brake lights turn on.

Last edited by jaketoolson; Aug 2nd, 16 at 7:31 PM.
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post #8 of 10 (permalink) Old Aug 2nd, 16, 9:01 PM
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Re: Tail lights and blinkers - somethings weird

The brake light should turn on when the switch plunger is out no matter what the ignition switch is doing. That part sounds correct to me.
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post #9 of 10 (permalink) Old Aug 2nd, 16, 9:34 PM
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Re: Tail lights and blinkers - somethings weird

Yes the sockets needed to be grounded. Without a ground the voltage backfeeds until it finds a ground.

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post #10 of 10 (permalink) Old Aug 3rd, 16, 12:39 AM Thread Starter
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Re: Tail lights and blinkers - somethings weird

Quote:
Originally Posted by Dave Birdwell View Post
Yes the sockets needed to be grounded. Without a ground the voltage backfeeds until it finds a ground.
My lack of understanding is what caused my tailspin. I didn't want to be that guy with a grounding issue so before I posted I made sure everything that has a ground wire coming off the new kit was grounded - I made sure the surfaces were bare, had new screws, ground straps for the engine and frame... Never realizing the sockets were also a ground, completing a circuit...

Thanks everyone!
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