Think of your marine batteries like a flashlight where the battery's stack on top of each other. With 3 battery's you will end up with a + positive and at the other end a -negative. Attach your + end of the charger to the the +positive end of your battery's and the -negative of the charger to the -negative of your battery's.
First of all do you have 3 or 4 batteries your cranking battery is not to be wired into this 36 volt if you have 4 batteries you have 3 for trolling motor and 1 cranking battery look on your charger see if the banks or numbered 1 2 3 4 .... you got to find what battery is # 1 depends on how they hooked in series if you hook charger on wrong battery most the time a red light comes on telling you wrong battery move wires till green lights come on all batteries.# 4 goes to cranking battery if you only have 3 batteries you don't have 36 volts you have 24 volts and a cranking battery if so # 3 goes to cranking battery
SOURCE: how do i hook up the 3 12 volt batteries for 36
Not sure why you need 36V but here's how.
<--P---N----P----N----P----N------>
Bat 1 Bat 2 Bat 3
You basically string them together. If you put a voltmeter on each end of the group you should have 36 volts or near it depending on the charge of the batteries.
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