This is probably obvious but I’m not sure. The boat I bought has two batteries up front for a 24v motor, but mine is just a 12v. The two arn’t pigtailed together so It’s just drawing off one batt. My question is could I hook them together and draw evenly off both of them and therefore go longer between charges? or would that damage the trolling motor. If yes do I just connect the wire between the two positive posts? Thanks!! Scott
Yes, you can do it. Here’s a similar post that may help you.
You can connect the batteries in parallel (positive to positive and negative to negative) or you can switch between the batteries. In my last boat I had 2 plugs for the 12v trolling motor and I would just switch from one battery to the other.
It will only be as good as your worst battery. If one is different or older it may have a slightly lower voltage and the “better” battery will try to charge your other one until they match. Just like jump starting a car.
For best performance 2 matching batteries will work the best.
Quote:
You can connect the batteries in parallel (positive to positive and negative to negative) or you can switch between the batteries. In my last boat I had 2 plugs for the 12v trolling motor and I would just switch from one battery to the other.
x100, your trolling motor will troll longer this way, I have mine this way and can troll 2 full days without a night charge,I run a PD55 V2.
Make sure batteries are of equal age and amps or you only as good as your worse battery,as stated above.
Fantastic! thanks for the promt responses and info as always guys 
My boat has two batteries up front hooked in parallel for the trolling motor, 12V 55 Terrova.
This lets the batteries take care of having to determine
where to draw current instead of having to switch, which usually occurs at the most inopportune moments.
I also have an MK2-DC with one bank feeding each of the batteries.
Really sweet setup as we do not have elec access on the campsite.
Spot locked for pretty much 5 days on Kab this opener with
no issues.
Use a switch, when one dies then you switch to the other. 2 seconds of fishing time lost, MAX. This way you are not limited to your worse battery but have full capacity of both batteries available.
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