I have no clue on how to hook up a stereo system i paid somebody to do it for me they have yet to get it right yet. My question to someone is I have four tower speakers running on one amp and a 10 inch sup running off another amp. I have two batts running the system with a rely switch the problem that i am having is batt 2 the stereo batt goes dead after running the system for 2 hours with the boat being cut of is it ok to run batt 1 Parallel to batt 2 would that be ok. If anyone has a diagram the could share with me so i could care it to the install man that would be great thanks for the help.

see the post here called wiring diagram or do a search on this site for battery install.