Quote:
The RCA leads from empeg to amp are new, albeit cheap-o, as is the amp.


RED Alert! Danger! Warning!

I would check the grounding of your amp straight away, don't bother with the rest. You should ensure a short DC ground wire, VERY heavy gauge, grounded to bare metal on the car chassis.

I'm willing to put money on you having a puny ground wire that is grounded onto paintwork.
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One of the few remaining Mk1 owners... #00015