karl f said: (quoted from post at 07:13:03 06/09/09) have a customer with an externally regulated motorcraft alternator. He bought a "one wire conversion" kit from us (it"s really a mini sized external regulator made by Victory Lap that bolts on back). If it was a street car, tractor, or similar i would not have a question; but this is a drag car that needs an emergency shutdown master switch accessible at the rear of the car. The battery is already at the rear.
I want to help him wire the switch correctly so that in worst case scenario--with the engine wide open and driver passed out--everything will kill yet at the same time prevent the alternator from being damaged during what he calls "tech" where they sometimes pull the switch to test that it actually works.
Right now he has a single pole master switch with only 2 terminals on it. Being a race car, i bet he spent big money on it, so if there is a way to do this with that swich, he"d probably like to go that route. If not, what is/are the other option(s)??
quick note about the regulator kit, all the wire connections are external, easy to get at, and have a few inches of wire coming out of the regulator, so any connection that needs to be modified can easily be changed.
thanks in advance
karl f
If it will pass the kill switch qualifications, wire the alternator to the battery side of the kill switch. That will allow you to cut power to all circuits but the alternator.
If all power must be cut from the battery, including the alternator, install a 20 volt zenor diode at the alternator. That will send to ground any voltage over 20 volts and should protect the alternator.
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