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Old 09-13-2007, 08:08 PM
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One wire alternator question

Hello all,
I installed a different alternator on my 53 f100 tonight and have a couple questions. I took the alternator off an engine that I bought a couple months ago and the guy said it was a GM one wire. There is a heavy gauge wire from the battery post that I am assuming is the power wire. It then has a 2 wire plug with one wire going to the batt post and the other one was cut and leading to no where. The other post was is labled GRD and went to ground. Now, I hooked the power wire to the main power wire in the harness and hooked the other to ground. I left the other wire unhooked. I then started the truck and put a volt meter on the battery. It read 16.3V at idle and 17.1V when I reved it up. I rechecked the wires and voltage and it still read this high number. I then quickly shut it off because I thought it was too high. So my question is, does this sound like too high of voltage? I thought it should be mid 14V. Secondly, what would cause this high voltage? I will tak ethe alternator off tomorrow and get it checked to see what it is testing there. Thanks in advance for any help.

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Old 09-13-2007, 08:20 PM
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the voltage regulator is shot, also that is not a one wire.
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Old 09-14-2007, 07:19 AM
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Go read this from MadElectrical All about one wire versus three.
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