I'm trying to install a Bartolini NTMB hr-4.6 preamp/harness into my bass and, I can't for the life of me, get it to work correctly. I'm pretty good with soldering and electronics and I've installed preamps before with no problem but I can't get this one to work. For some reason, I can't get sound out of the bridge pickup. I know everything is wired correctly according to directions. All the wires are in tact but the bridge pickup just won't work. I've been spending all night on it and I can't get it too work. And just when I think it works and I get sound, I install the blend pot and nothing. I know it's a long shot but any ideas out there? It's driving me crazy. Thanks,!!!