Jump Starting a boat with dual batteries.

[flightdoc]

I am wondering how to jump start a boat with dual batteries. Do I hook up the cables to just one battery and turn the switch to the same battery. Do I hook up to the one battery and leave the switch on both. Or do I hook up to a positive on one battery and a negative on the other battery. 12 volt system. Two batteries run in parallel. Any help would be much appriciated.

 

[flightdoc]

Re: Jump Starting a boat with dual batteries.

Thank you.

 

[Silvertip]

Re: Jump Starting a boat with dual batteries.

See the BOTH setting on the switch? Set it there. The batteries are now combined. Or switch to BAT 2 and start the engine. No jumper cables needed. The only problem with this would be if the switch iw wired incorrectly where BAT 2 is wired to the switch with anything less than battery cable size wire.