Ok I just installed this system into my SR496 bass with the existing 40p and 40j emg pups I put in last week. After I installed the pre-amp and new battery, I connected it to my amp (which is working). The only sound coming out is very faint or very low volume. I checked all the connection again and they look good. I dont like the fact that there is only room for 1 battery, but do I need 2 for not just the headroom but to get some volume out of it. I know it could be anything and I double checked everything. Loose ground maybe or do I need to use any of the grounds ex.bridge? The instructions say no. I dont know but Im begenning to loose mind!