Sounds like Master Reset (turning off and reapply of power) solves your problem. What that does is reset the computer inside the radio. So most likely that is issue you are having. Maybe double check the crimps on the constant power (Yellow or Yellow Black) and switched power (Red) for a loose connection in the crimp. Check for a loose crimp on the Black wire on the ground connection.

The only reason to add another ground is sometimes you can reduce hiss or humm adding a chassis connection connection from your receiver to an external amp. But since this is a all in one not an issue.

Easy change out is to buy the same brand of radio and take the old one out and add the new one in. No connector change out and is quickly done.

Good Luck,

PT

Wow! If you can reach in those gauge blanks and reach stuff, your hands must be even skinnier than mine! (and mine are mighty skinny!) :-)

The problem with your radio is likely with the radio itself. Pulling fuses and harness connectors interrupts the constant 12 volt current (that runs the clock and memory) and likely resets some parameter that's "confusing" the radio. Sort of like how curing problems with Windows can be done by restarting the computer. Bet if you pulled the fuse (that supplies constant 12V - different from the one for the radio proper) from the fuse box, or disconnected the battery you'd have the same result.

The original radio should have a single ground (and the speakers ground through that via the radio itself).

-Ryan
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Athens, Ohio
1990 245 DL 133k M47, E-codes, bunch of fun accessories
1991 745 GL 290k (Girlfriend-mobile)
Buckeye Volvo Club