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Comment by AGP # on November 26, 2023 at 12:55pm

Yes BQ, it was bought new, it did work, the power indicator light doesn't come on, yes it does have a fuse which seemed fine when I opened up the board, and as far as I know the Battery Wiring is Correct, no manufacture date, both new Batterys read 6.33V individually, and 12.66V when wired together, and the old used Batterys, after recharging  read 2.08V and 0.63V individually.

Thanks for the interest and reasons for why it should or shouldn't work, have been a bit pushed for time lately, but will open the wiring board up again soon, and have another look, particularly the power switch, which I didn't check before, unfortunately my in depth knowledge of most things electrical, is limited to say the least. :-(

Comment by BrianQ. on November 22, 2023 at 3:56pm

Forgot to ask, did it ever work? was it new or used? If it came used, it may have a burnt power transistor (happens quite often on low power solid state amps)? does it have a power indicator, does it light, can you do a continuity test on the bulb? Does it have a fuse, have you checked that? If the fuse is bad, then it probably means a power transistor is failing & will probably keep tripping  the fuse? I will go as far as to test the power switch too? Did you make sure the battery wiring is correct? 

Comment by BrianQ. on November 20, 2023 at 5:27pm

I usually do a continuity check on the cables connected to the battery? Hook a pot up to one end & twist it back n forth, if it doesn’t show any resistance, then the cable has a short somewhere? Also wiggle the cables where they connect to the terminals, those are famous for hiding wire breaks? Do the replacement  batteries you bought have a manufacture date, they could be old too?