Quote Originally Posted by 632 Regal View Post
Mine is different:


The part under the cooling fins is not accessible, clipped in with heavy duty pop together clips. I did use a stainless brush on the solder areas I could access and it tries to come on and fizzles out. Can repeat this sometimes so I will try to reheat the solder contacts under the capacitors and see what happens.
FWIW

This 540 I bought came with the stock Amp removed. Looked like the PO tried to use an aftermarket Amp but I just wired the harness back onto itself bypassing the amp and the head-unit is the only power source

one issue that may arise from this is engine whine.

I sometimes get it using the GROM USB but not with the radio or a CD.

You ought to be able to connect the speaker wires if you don't mind splicing so you can at least use the head unit..