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Pulsating Interior Lights and Voltage Gauge With Turn Signals

907 Views 26 Replies 9 Participants Last post by  sleepyhollowtaman
We are working on completing a full restoration and when I turn on the turn signals, the interior lights and the voltage gauge pulsate. In addition, they dim when pressing the brakes. I have tried it with the car running as well and the same results. Here is what I have tried so far:

  1. New Battery was installed recently and is fully charged
  2. New Alternator was installed recently
  3. New headlight switch
  4. New printed circuit board on back of instrument cluster
  5. Scraped off the paint to make sure my grounds have good connections
  6. Unhooked the hardness for the taillights, turned on hazards and same results which leads me to believe it’s not in the rear lights.
  7. Verified the following grounds:
    1. Right and Lift side headlight grounds coming out of harness to core support
    2. Ground from battery to the front of the block
    3. Ground from the back of the engine to the firewall
    4. Ground from the transmission to the frame
    5. Ground connected to the dash from the instrument cluster
    6. Ground from the rear lighting harness
Is there somewhere that I could hook up an additional ground to verify if it is a grounding issue or to solve the issue?

Thanks for the suggestions as this one is really starting to frustrate me. I don't want to put the rest of the stuff in the dash and interior until this is resolved.
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I'd try (with jumper cables at least) a ground from the battery to the frame.. I know the ground from the tranny to the frame should be just fine, might also try a ground from the battery to the firewall. Sure sounds like something isn't grounded or grounded good, hard to say exactly what.
Well, to determine if it's a ground issue or a 12v+ issue, run a ground from the battery to the ground on the interior light and see if it does it under the same circumstances
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