Pioneer RCAs Trouble

[SMFJ 10+ year member]

A few months back I hot swapped my RCAs one day playing around with one of my subs. I'm pretty sure I blew my PICO fuse that day in my Pioneer 4100UB. googled about and found into on grounding RCAs long story short grounding the RCAs got rid of 95% of my noise issues which is quite livable.

Only complaint I have is the thud coming from my left speakers when I cut my car on and off. Thud became second nature.

I picked up the GT-42 in the classifieds here today and I can only get continuous mid-low power out of the right RCAs. Tested the amp with the iPhone a few minutes ago and it worked like a champ. So I know it's my head unit. When I connect the left channels from the head unit to the amp it plays in short bursts as the safety light flashes.

Head unit works fine with my MB QUART Q4.150 with grounded RCAs besides the thud.

Is there a way to eliminate current flow in the RCAs I believe that will fix my problem. Me and my head unit have a a lot of history and I really don't want to scrap it. ALL IDEAS WELCOME.

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[mylows10 5,000+ posts]

ground a wire from one of the rca's to the back of the deck

 

[SMFJ 10+ year member]

ground a wire from one of the rca's to the back of the deck

In the initial installation it was like this exactly from my other amp except I have 6 channels. http://www.caraudio.com/forums/wiring-electrical-installation-help/198477-engine-whine-ground-loop-fixes-take-two.html to no avail. I need to kill what power is in that line before it hits the amp. Any ideas.

 

[mylows10 5,000+ posts]

Internal ground is jacked up. Should be like a $20 fix if even that at a shop

 

[SMFJ 10+ year member]

tv shop or something?

 

[SMFJ 10+ year member]

Any other input?