Try grounding the radio directly.
I was having this issue with an aftermarket unit on my S14.
The aftermarket harness didnt come with a ground wire (like previously mentioned, the radio's grounded through the antenna plug)
So for aftermarket radios, you need the antenna adapter and then run a ground wire directly from the radio's harness.
Hope that helps, Good luck!
Last edited by SlmdCpe; 11-29-2017 at 07:14 PM..
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