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Old May 26, 2016 | 11:59 AM
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Default License plate light

I repaired the wiring on my license plate light and now it stays on all the time, even with no key in the ignition and headlights off. If I remove the ground wire, the light goes off, but that is not the answer. Any ideas.
The car is a 1972 Stingray, SCG, 4 speed, just a basic 'Vette
Thanks,
Dave
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Old May 26, 2016 | 12:57 PM
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Hi Dave,
Did you put the ground wire back in place under the clip?
???
Regards,
Alan


Last edited by Alan 71; May 26, 2016 at 12:57 PM.
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Old May 26, 2016 | 01:12 PM
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what do you mean you repaired the wiring, its seems whatever you did has tapped into the wrong wire for power. The license light should be on at the same time as the taillights so if the taillights are not on all the time the license plate light is getting power from the wrong source.

Last edited by MelWff; May 26, 2016 at 01:12 PM.
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Old May 26, 2016 | 01:17 PM
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Hi mw,
Maybe the wire for the fuel sender?
Regards,
Alan
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Old May 26, 2016 | 02:55 PM
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Hmmm -from the factory- there no constant hot wire - in the back of the car.

However - there is a constant hot wire that runs to the back interior light-it's orange- and it is in the same harness.

Try disconnecting the rear harness on the drivers side - up near the fusebox. It's got 12 pins-but only 8 wires. See pic

If the plate light still stays on- then somebody has adding a +12 wire somewhere-somehow?

If it goes off- plug the harness back in and pull the courtesy light fuse- if that stops the light- you'll need to troubleshoot the harness.

wiring diagram for a 72-

http://www.keystonestatecorvetteclub...tte%201972.pdf

Sorry ...my pics are not as good as Alan's!!!

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Old May 26, 2016 | 03:02 PM
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Nobody's pictures are as good as Alan's. :-)
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Old May 26, 2016 | 04:44 PM
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Alan could publish a coffee table size book of nothing but the pictures and a short description, I bet it would sell.
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Old May 26, 2016 | 05:13 PM
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The light gets fed from the brown wire which is also for the parking lights. If the headlight switch has the parking lights on, the license plate light should be on too.

As Rich454 said there is no constant power back there.
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Old May 26, 2016 | 09:22 PM
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I used to hang at a repair shop near my house and like I said I dig auto wiring, they were having a devil of a time with the license plate bulbs kept popping, it was a modded mini truck, one guy said it was shocking the pi...hell out of him, I hit the wire with a volt meter and it was off the charts...hum... I reached up in there and a cube,
Turned out a person had added a neon plate frame and they have small transformers the neon was gone so of course when you placed a 12v bulb on that feed wire from that transformer it would blow the bulb and bite ya,

Not the case here but the point is we have no way to know who did what in the past.

Wouldn't the key be what the op did when they repaired the wiring, what was their repair goal, what needed repairs and was the wiring already hack jobbed needing the repair...for the license play to light on it's own with everything off it would have to have a 12v wire going to it, from where?
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Old May 30, 2016 | 04:54 PM
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Default License plate light

Guys,
Thanks for the tips on my problem...I cleaned up my wiring and found that a previous owner had tapped into a orange wire and spliced it into the brown wire going to the plate light. It seems that the orange wire is hot all the time and uses a ground connection to activate the circuit. This sounds like the alarm circuit that is no longer used. I plan on splicing into the brown wire that goes to the side marker lights. Hopefully, this will solve one of the many problems that come with an old Corvette, but I love this old car....
Dave
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Old May 30, 2016 | 08:14 PM
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Good deal-

The orange wire is for the back interior light and the glove compartment light.
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Old May 31, 2016 | 11:18 AM
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Originally Posted by Richard454
Good deal-

The orange wire is for the back interior light and the glove compartment light.
On a 72 there is an always hot orange wire going to the key switch to the alarm on the back panel by the license plate. That is probably the one you see tapped into.
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Old May 31, 2016 | 11:39 AM
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Originally Posted by 65GGvert
On a 72 there is an always hot orange wire going to the key switch to the alarm on the back panel by the license plate. That is probably the one you see tapped into.
I spliced into the brown wire going to the side marker light like I planned and I now have a license plate light. No telling where the original brown wire is. Problem solved.....
Thanks,
Dave
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Old May 31, 2016 | 02:45 PM
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Originally Posted by hinemadm
I spliced into the brown wire going to the side marker light like I planned and I now have a license plate light. No telling where the original brown wire is. Problem solved.....
Thanks,
Dave
Any of the brown wires to the rear lights would work. Glad you got it straight.
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