BATTERY WIRING

[tony9631]

I’m sure this is out there somewhere but does anyone have the information/diagram/list on which wires should be connected the crank battery and which should be connected to the house battery? I know they are all labeled with primary isolator, starting, secondary isolator, and etc.
I show cranking volts, they are just at 11.6 while running which is low and they will drop to 11.1 when using ballast pumps so I’m only assuming the batteries have a mismatched wire somewhere from previous owner which isn’t allowing the alternator to charge.
When I trickle charge the batteries they will rise to 12.2 crank and 13.2 house with the boat off.

[chpthril]

I dont have a schematic, but my git says there is an issue with Isolator. With the engine running, rotate the battery switch to the 4 oclock position and see what the helm voltage reading says. 11.6 is basically and dead battery. I would also want to touch a volt meter to each battery with the engine running. When diagnosing charging issues, I tend to ignore the helm voltage and go straight to the source.


Tige typically makes the outboard battery as the main cranking and the inboard battery as the house.