Hello, I have been tinkering with my dual battery wiring on a cruising sailing boat, fitted with a Volvo Penta 2002 diesel engine. Things seem O.K., except for my Makita diesel heater, which won't turn on. One dual core wire leading to the battery has me confused. Sheathed in black, there is a red wire and a black wire coming out of the sheath, both with in-line fuses. I have connected these to the +ve and -ve of number 2 battery, but I'm not sure if these were the original connections. I can attach a picture if it helps.
Regards,
Richard
Regards,
Richard