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Old 02-19-2010, 04:18 AM   #1 (permalink)
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Default Split charging (dual battery) system issues...

Hi folks

I have recently installed the wiring for a split charging system in my 1998 diesel Vitara and have used a 40amp relay in the process. I have connected the pins on the relay as follows:

Connector 85 = chassis earth
Connector 86 = Relay switch - wire from warning light/alternator
Connector 87 = charge to battery 2 (currently only a wire running to the boot - battery yet to be installed)
Connector 30 = charge feed from alternator

I have all of the above in place, however when I measure the voltage from Pin 87 it reads a constant 12volts until the engine is switched on where the voltage increases to 14Volts - this does not seem correct as I would have thought that this pin should read 0Volts when the engine is off, am I correct? It would seem that perhaps there is a faulty relay involved?

Many thanks

Jay
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Old 09-28-2010, 07:26 PM   #2 (permalink)
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Sounds like a bad relay to me. The voltage seems fine, but there definitely shouldn't be any with out supplied power to pin 85 or 86.
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Old 09-28-2010, 07:52 PM   #3 (permalink)
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Do you have voltage on pin 86 of the relay before you switch on the engine?
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