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We’d need to see a picture of your 3PDT wiring as it is now so we can trace the wiring
It looks like your main pcb IN and OUT ‘T’ for tip pads go to the 3PDT as they should, the black wires, but we can’t see where, it also looks like your orange ground wires go to the jack grounds
Double check your battery snap ground is in fact soldered to the ring lug on the stereo IN jack and not the tip, put a jack in and follow the connections around like below you could have your ring and tip connections mixed up
Not all jack sockets are laid out the same your tip and ring solder lugs may be different so stick a jack in and check