I have a reading of about 13.35 for my house bank and 12.25 for starter battery. This is when the engine is running or when plugged to shore power. The starter battery is brand new the house batteries are not. When i turn the engine off my starter battery reads 11 to 10.90.what should i be checking first. Its a heart intrrface link 200-r. I'm feeling a bit lost on the reading i've done and am having difficulty getting a marine electrician to look at it.
Thx
Thx