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I cant say with 100% certainty but the way the switch works is it Isolates the batteries in position 1 and 2.

If its in 1 the boat ignores Battery 2 as part of the charging system.

I know my...

You can see my Perko switch in the Stereo Makeover thread under general chat close ot the end i posted some pics of my amps and it has a clear picture of the perko switch.

I will prolly upgrade...

Mine was upgraded by the Dealer at the time of purchase.

Yes once the boat is running you can switch from battery 1 to battery 2 with no issues.

The same applies of i drain battery 2 down...

Yea it only charges the batter selected. 1 charges 1 and 2 charges 2. 1/2 charges both.

Draining works the same way UNLESS you have things wired directly to your 2 battery.

My sub amp was...