This is a bit more awkward then it seems, as the bass has 2 mag pups and a piezo bridge, and the bridge G intonation ran out of adjustment, and i dont really use the piezo, so i changed the bridge to a regular one. There were 2 wires to the original bridge , one for the earthing as per standard basses ( bare wire squashed when mounting the bridge ) and one that was soldered to what look like some tracks underneath the piezo brisdge , though they're not gold, but silver
I left the normal black earth wire under the new bridge, obviously, but the black piezo wire i coiled up and left inside the hole that it emerges from, which incidentally, is the same hole that the regular earth emerges from. Is this my problem ? The batteries are brand new 9v's ( one each for Piezo and Mags i presume ) and are going flat with bass cable removed in less than a week after a full charge