No switch. You're missing the point. The batteries must never 'see' each other, or they'll constantly try to balance each other. If the front battery is lower than the rear in charge, the rear will dump to the front to equalize. This is killing your battery, without even thinking of what the alternator is doing to try to keep up.

You'd be better off with a more powerful Alternator and a single battery than the way you have it.

Get an ISOLATOR and a bigger alt.

problem slove with 2 batteries. The speakers that i was running on the amp was incompatable and was pulling more power for the amp so they could work. Bought some new ones and everything is perfect now.
Thanx Guys