Joined: 01 Nov 2003 Posts: 8637 City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
Posted: Wed Mar 02, 2005 5:56 pm Post subject:
Sounds like you've got each motor connected to it's own battery., which is the correct way it's done with dual motors.
The on/off switch cross connects the batteries in parallel so that if either battery is down, the other one can be connected (jumped) to the dead one to get it started.
Usually the switch is left in the "off" position to keep each battery isolated to its specific engine. This is for two reasons:
1. If one battery fails to be charged by a dead alternator or to be able to be charged, the other one will charge and provide a back up.
2. Two motors (alternators, really) cannot be hooked to the same battery or batteries, as the alternator charge circuits "confuse" each other as they try to read the battery voltage and provide the correct charging rate.
Be sure to check the "dead" battery for full charge after some reasonable degree of charging.
Always leave the switch in the "off" position unless you need it to boost one battery with the other for starting, then change it back to "off" after starting.
HTH Joe _________________ Sea Wolf, C-Brat #31
Lake Shasta, California
"Most of my money I spent on boats and women. The rest I squandered'. " -Annonymous
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