Thread: Need quick addvice

DON'T DO IT! If you hook up the batteries in series for your troller, you will have 24 volts to every thing. 12 volt starters, electronics and all your accessories will smoke. You need 2 batteries dedicated to the trolling motor and keep the other one for the 12 volt stuff.

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Thanks man! That stinks cause I dont think I have enough room for another battery.

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Okay anoyher question. I made room for another battery so do I need to hook pos-pos and neg-neg on my two bank charger or can I just hook it to one battery and the other bank to the the 12 volt?

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That I can't answer. Send a PM to Barnacle Bill. He's the guru on this stuff.

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You may find your answer in the stickie at the top pf the page.

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Originally Posted by jigflinger

DON'T DO IT! If you hook up the batteries in series for your troller, you will have 24 volts to every thing. 12 volt starters, electronics and all your accessories will smoke. You need 2 batteries dedicated to the trolling motor and keep the other one for the 12 volt stuff.

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That's not correct. You can hook the two batteries in series for 24V (or three for 36V) and still run the outboard off of one. No matter what you do to the batteries, you will always have 12V between the terminals on a single battery.

There are a lot of gotchas in doing this:

You are going to be running down your cranking battery using it for the TM, so if it gets low you may be dead in the water. This will also leave you without a bilge pump.

If the current cranking battery isn't a deep cycle, it won't last very long using it for the TM.

If you have a US2 transducer, you can't do it because of the noise reduction system in the TM.

You are more likely to have TM noise in your fishfinder with this setup.

You have to make sure the TM negative and outboard negative go to the same battery to avoid current flow through the water and damage to the TM housing and shaft and OB lower unit.

Please explain how this is done.