Switch with 2 bank charger

[sdb]

I want to power my 12V trolling motor with one deep cycle battery at a time.
I have two batteries, a dual bank charger, and a 1,2,both,off switch.
I don't want to have the batteries in parallel. I want them independent, using only one at a time.
There is not a motor/alternator in the system.


With that said, how do I wire it?

I was planning on:
1) Taking both battery post negatives together to the negative of the trolling motor.
2) Taking the first battery post positive to the #1 input on the switch.
3) Taking the second battery positive to the #2 input on the switch.
4) Taking the positive wire on the trolling motor to the "feeder" (last of the three posts) on the switch.
5) The 2 bank charger has 2 postive and 2 negative outputs which would go directly to the batteries.

So I started doing this and got concerned about the negatives. If the negatives are tied together;
1) Does this affect the 2 bank charger?
2) Does this affect the battery that isn't "switched on" during operation?

Thanks for your help!!!

[Lancerbye]

The negatives being common is in fact common.(pardon the pun) The system you discribed should work fine. The multi bank chargers usually allow for a common negative and the positives are isolated so you won't get drain from the none working side.