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ARRGH Problemo with new rig

This has been talked about many times, but this is a different twist on it. AMP HISS! I just purchased an older Bag End d12-d cab and then bought an old Peavey Mark iii xp head to power it. I set it up last night and it was awesome. Absolutely perfect, no hiss, excellent sound ect. Well this afternoon I decided to use a little electronics cleaner on the jacke to just clean it a little as well as the eq slides, now it has thad goddamn hiss when you plug the bass and chord in! Am I missing something here? It didnt do it yesterday and this morning, now it does. Its driving me nuts trying to figure out why. Yes it stops when I palm thr bridge. Thanks for the help
 
Palming the bridge makes me think you have a loose ground wire in your bass. Also, do you have single coil pickups in your bass? That could also be a culprit.