the snows melting, the suns out..time to start thinking..have twins, seperate battery for each motor, would like to put a battery switch in, so I can turn them off, use both to start etc. do I need 2 switches or one switch?? how to wire it all in??? any help would be appreciated thanks.

I have a spare battery isolator here in Toledo if you end up needing one in your set-up. For two alternators feeding two or three batteries.

Chris

reddog, thanks, just noticed your pm and sent a reply..

I can't tell you how to wire it or how it works because I haven't really thought about it. BUT I can tell you that I've got twins, two batts and one Perko switch with OFF-Bat 1-BOTH-Bat 2 positions.
So it can be done.

Shure would like to know how you did it, because I have 2 Perkos, 2 batteries, One still runs one side and accesories, the other runs just the other motor. 1 will not supply the other???

one perko for each engine with them linked together. When you want both batteries for one engine turn both perkos to the both position.

Jeff, mine came like that from the factory I think. But to be honest, I have to check and see exactly what each battery/setting powers up. I'm pretty sure you can start & run both motors from either battery.
I've got all my factory manuals too. I'll have to puruse and see if the battery wiring diagram is in there.

I always have them switched to both. Surveyor said they were not wired for tandem.

we can fix that... no problem

I have 2 switches, 1 for each motor/battery. A dual switch allows you to have 2 totally separate systems for normal use, the abilty to start either motor off of either battery, or use both batteries to start 1 motor. Best of all, always 1 good battery.
I never leave my switches in the both position. 1 dead battery=2 dead batteries.