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Every time my air compressor would shut off I got a loud annoying pop through the radio. Even if the radio was off I would still get the pop.
I knew it couldn’t be good for all the electronics in the truck so I tried a mod I got from a golf cart forum.
Diodes across the relay signal terminals need to be installed in performance carts to protect the electronics.
I put one of these diodes on my truck this week. 100% of the pop is gone.
Thanks for posting about this. I have had that on different vehicles in the past and that looks to be a simple solution. I've had to ground RCA outputs on head units, shield and ground chases for speaker wire and all kinds of different fixes to get rid of interference, pops and static over the years.