Can't Get Enough
Join Date: Feb 2000
Location: Charleston, SC
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Re: dual battery question
I use this exact system and have not yet had any problems...
The oil switch is a "make" switch. When there is oil pressure the switch makes contact. This means when the vehicke isn't running the single battery is isolated. It can be run down to nothing, then the button switch ( I use a marine HD momentary contact switch) can be pushed while starting the vehicle, thereby using both batteries. The whole premise of this system is the oil switch. I guess if you use a simple "on/off" switch this will also work, but that leasves things to be forgotten and then it isn't childproof..I need childproof.. I am getting forgetful...
Very simple and easy to build..