Hooked up, but not in series. He had two in series, but the third was not wired into the string.
He had the ground wire from battery one going to trolling motor ground. He had a jumper wire going from hot on battery one to ground on battery two. Good so far. He then had a jumper wire going from hot on battery two to hot on battery three and a ground to ground connection on those two batteries. He then had the positive wire from the TM hooked up to the hot wire on the third battery
This only put 24 volts to the trolling motor.
I rewired it negative post battery one to TM negative wire. Positive post to negative post battery one to battery two. Positive post from battery two to negative post battery three. Positive post on battery three was then hooked to the positive wire on the TM, thus giving me three batteries wired in series, meaning I have 36 volts to the trolling motor. You can keep wiring batteries together in this sequence and it just keeps adding to the total voltage delivered to the end use. 12, 24, 36, 48, ad infinitum...
If you hook negative to negative, positive to positive, you just add longer life to the device being powered, but no extra voltage. It will constantly be 12 volts. It's like having a 1 gallon tank and adding extra tanks to it. You still get the same amount of fuel out of the fuel line, it just takes a lot longer to empty the fuel, in this case, electricity.
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