I just bought my first fiberglass boat. The previous owner installed an on board charger on it but only hooked it up to the trolling motor battery. Is there a reason he didn't hook it to the cranking battery too?  It has another cord on it to hook up to another battery. The cranking battery has all the electronics hooked to it as well.  Any advice would be great. Thanks in advance. 

Hello Cody and Welcome to Bass Resource ~

Including 'every battery' in the charging system is a solid plan.

The on board charger needs to have a ' separate bank' for each battery.

So if you have 1 trolling motor battery & 1 cranking battery - a two bank charger will work.

If you have 2 trolling motor batteries & 1 cranker, then you'd need a 3 bank charger to throw juice to all three.

You can look up the make & model number of the charger to ensure that model is so equip.

A-Jay

 

1 hour ago, A-Jay said:

So if you have 1 trolling motor battery & 1 cranking battery - a two bank charger will work.

If you have 2 trolling motor batteries & 1 cranker, then you'd need a 3 bank charger to throw juice to all three.

Exactly this!

I I don't know why he wouldn't hook up the cranking battery.  Unless something is wrong with that charging bank.

Thanks!  Yea that's what had me confused too. It's seems he just taped it up and tucked it in behind the charger. It looks like it's never had any connectors put on it. I'll hook it up this evening and see what happens. Thanks again fellas!

Get that thing rigged up and report back!

Will do!

Well to update y'all I hooked the on board charger up to the cranking battery and it successfully chargers both batteries! Nothing burned down! haha I just thought the there was a reason for it not being connected and didn't want to burn down my rig lol Thanks for the advice guys. 

Glad you got it figured out.