Battery 1 Neg terminal to chassis, pos terminal connected to neg terminal of 2nd battery and pos of second battery to starter and other electrical feeds.

Answered by mhpautos (expert)
26,869 answers provided

Who told you this is a 24 volt system??? It is not and do not attempt to hook it up as such!! Batteries are in parallel (neg to neg and pos to pos) to make it a higher current system at 12 VOLTS. NEG will go to the ground side of vehicle and the positive will go to starter and lift gate if so equipped. If the batteries are behind the drivers side mounted on the frame, facing them the negatives will be on the left (towards driver) and the positives will be on the right towards rear of truck. Batteries will have two buss bar connectors, one for the negatives and one for the positives with two battery post connectors for each one.

Answered by julianburke
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