Battery Isolator - Negative

Need a spark. All those tedious electrics, lights, tacho, wiring harness, etc

Battery Isolator - Negative

Postby Simon1 » Fri Mar 15, 2013 9:01 pm

For CAMS I need an isolator switch on the battery that kills the engine. I have gone with the negative lead - everything works as it should, breaks the circuit and kills the engine.

However

When the master isolation switch is off, but the ignition key is still on, the voltage leaks down though all of the sensors etc from the positive side of the battery and there is a 12 volt potential between the chassis and negative side of the battery!

I found this out while trying to find out which wire on my brake lights was for the parkers. I was holding the earth wire for the light on the negative side of the battery and accidently dropped the positive so it touched the chassis - it lit up like a Christmas tree

What do you reckon, is this a problem???
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Re: Battery Isolator - Negative

Postby Jet » Tue Mar 19, 2013 2:39 pm

Put the Regulators (square thing with fins) negative feed on the battery side of the isolator, this breaks the circuit.
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