Quote:
Originally Posted by Dead Parrot
Ground is pretty much all or nothing. A lot of things have multiple paths to ground. I suspect that you are correct about trying to start with the large switch open would let the smoke out of the small wire. A lot of radio speakers also ground to the frame even if they have two wires to each speaker. Possible those 'ground' wires from the speakers could also go poof.
Swap the switch to the positive side and run a small fused wire for the radio memory.
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Seems to be the safest way …to keep from cooking things…