New pre amp

[fryer]

I've just fitted a new on-board pre amp, and can't get any signal out of it. I've checked the wiring, which all seams ok. Is there anything obvious I could check ?

[Buzz]

Battery?

[BOD2]

Are you using a stereo jack socket (with 3 contacts) ?

This is required to switch the battery on/off when the jack is inserted into the socket.

I would check the wiring at the jack socket and make sure it's all correct there. Also make sure that nothing is shorting out when you reassemble the bass - try insert some card as a temporary insulator anywhere where things could touch the metal of pots or any cavity screening.