Join Date: Jan 2003
Location: Maine Coast
Thanked 270 Times in 207 Posts
Rep Power: 17
the easiest thing to do to prevent frying the diodes is this.
#1 Remove and move the charging wire that goes from the alternator to the battery switch. Move the switch end of this wire and wire it direct to the house bank. Now you can not disconnect the "load" from the alternator with the engine running as it's now wired direct to the load/batteries.
#2 Add an ACR type charging relay, automatically combines banks when it senses charging voltage, or an Echo type charger which is basically a 12V battery charger that kicks on at charging voltages to charge the start bank without actually combining them.
You have retained your 1/2/OFF/BOTH switch but made it safe for your alternator. Just remember that it will not eliminate "stupidity" and the human factor of you leaving your switch in the "both" position and killing both banks...
-Maine Sail / CS-36T
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