Thanks, I’ll try that.

I inherited a 1994 Ranger from my Brother, I know he was using it. But… He was an electrician, I am not. There are 3 batteries in the rear, a single 12V battery (starboard) and 2x12V wired in series for 24V. To winterize the boat, he disconnected all the positive wires. I have the engine and other 12V system running, there was only 1 positive on that side and it could only reach the single 12V battery. Its the other side that is killing me. The rear left/port side has a circuit breaker with 4 wires coming out. One each Black, White, Red, Orange. The black one is connected to the negative side of the 2 battery arrangement, the other 3 are loose. Where do these 3 wires go?

Attachments:

1. 

   24V-system.jpg