Wiring set-up for battery switch.
Here are some more details, engine is a Yanmar 2GM from 1986 with a re-built starter and new solenoid in 2000. The main wiring for batteries, alternator, panel and starter was replaced in 1988. The altenator output is 13.5 volts. The boats electric requirements are light, instruments, Vhf, Gps stereo and lights.
From time to time, the starter would not kick in and I have been forced to jump the terminals on the starter. I am a novice when it comes to electrical work. I thought maybe that the cranking amps are too low to force the solenoid to kick in and hence my questtion concerning battery type and wiring.