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Hi Olley,
You need a double throw double pole relay. Terminal 87 is normally open and 87A is normally closed. Terminal 30 is common. Terminals 85 and 86 are the energising coil. When the coil isn't powered 87A is live and 87 is dead, power up the energising coil and 87 becomes live while 87A is dead.
Hope that helps
Regards
Doug
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Hi guys using a split charge diode, when the engine isn't running the chassis battery is isolated and can't power anything, that's why I need a "normally closed" relay to give an alternative electrical path.
hi sifta how would a ballast resister work?
olley
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PS the alternator has "voltage sensing" if it detects the system voltage has been lowered by a split charge diode wired directly after the alternator, it simply boosts it's output voltage to compensate. Been there, done that, got the tee shirt.
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I'm not sure why you want a diode in your starter circuit Olley.
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