1970 Changed bumper, now both tail lights and aftmkt gauges flash with turn signals?

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Old Sep 1, 2023 | 11:49 PM
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Ku1210's Avatar
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1970 Changed bumper, now both tail lights and aftmkt gauges flash with turn signals?

I changed my 71 rear bumper to a 1970 because I like the tail lights better. Got everything in and turned the ignition on to find the tail lights work, but the turn signals make both tail lights blink along with the after market RPM gauge, battery gauge, oil and temp gauge under the dash. I also noticed when taking the old bumper off the old tail lights had some strange wiring. see attached image. Should I just clip those off and solder them into my new tail lights? I don’t understand how that would fix it but it seems this has something to do with how the after market gauges that I didn’t install work?



Weird wiring
Old Sep 2, 2023 | 05:52 AM
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Once again, this is why I so hate OPW (other people's wiring). I have no idea what is going on there, but you've clearly got some coupling between the turn signal and the tail light circuits. Be sure the tail light housings are well grounded. After that, it's impossible to know what wonders the wire harness holds, but you'll have to trace the wiring. We can't do that through the interwebs.
Old Sep 2, 2023 | 06:53 AM
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Ku1210's Avatar
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Originally Posted by joe_padavano
Once again, this is why I so hate OPW (other people's wiring). I have no idea what is going on there, but you've clearly got some coupling between the turn signal and the tail light circuits. Be sure the tail light housings are well grounded. After that, it's impossible to know what wonders the wire harness holds, but you'll have to trace the wiring. We can't do that through the interwebs.
Is it possible it’s just the ground being an issue?

Last edited by Ku1210; Sep 2, 2023 at 07:04 AM.
Old Sep 2, 2023 | 10:42 AM
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Originally Posted by joe_padavano
Once again, this is why I so hate OPW (other people's wiring). I have no idea what is going on there, but you've clearly got some coupling between the turn signal and the tail light circuits. Be sure the tail light housings are well grounded. After that, it's impossible to know what wonders the wire harness holds, but you'll have to trace the wiring. We can't do that through the interwebs.

OPW, I’ll have to remember that one!

Cheap butt connectors, wire nuts, cheap electrical tape that sticks to nothing, dozens of splices in the same wire, and everything wired with the same color wire, I know exactly what you mean.
Old Sep 2, 2023 | 10:49 AM
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Fixed it by connecting the ground to power on left, power to power on right and leaving all else disconnected. The company that made the housing must have reversed the wiring or something
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