We have a, new to us, 92' Hunter 33.5 with the 3gm30. The current battery set up is a single group 27 cranking battery and two parallel group 27 deep cycle batteries as the house bank. As recommended I want to use the house bank (#2) as the primary and the cranking battery (#1) as the backup.
The engine fires fine on the cranking battery but when switched to the house bank it barely turns over. The house bank batteries are new this season and are at full charge. Someone suggested this is most likely a wiring issue, possibly a bad ground connection.. Does the house bank have a separate ground? I assumed the ground from the selector switch to the engine applied to both banks. Electrical is not one of my strengths so a little guidance would help.
The engine fires fine on the cranking battery but when switched to the house bank it barely turns over. The house bank batteries are new this season and are at full charge. Someone suggested this is most likely a wiring issue, possibly a bad ground connection.. Does the house bank have a separate ground? I assumed the ground from the selector switch to the engine applied to both banks. Electrical is not one of my strengths so a little guidance would help.