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Old 01-20-2003, 10:21 AM
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Post 2 Wire to 1 Wire Alternator

Someone told me this was a good thing to do. Is it hard to do? Is it worth it? I've got a 91 Sonoma conversion running the original 2-wire 85 amp alternator. I've got the 100 amp alternator that I picked up with the new(er) engine, but it only uses 1 wire. What do I need to do to make it work?

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Old 01-21-2003, 02:23 PM
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call Original Parts Group in Huntington Beach CA. They'll be able to answer your questions and then you can order the kit from them. Their number is
1-800-243-8355.
Good Luck
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Old 01-24-2003, 12:26 PM
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remove the smaller of the two wires and chuck out. bigger wire goes to starter/+ battery. that's it.
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Old 01-27-2003, 11:01 AM
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Where does the OTHER end of that small wire go to? Do you need a different voltage regulator? Or are these 1 wire alternator have the voltage regulator built in?


Todd <img src="confused.gif" border="0">
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Old 01-30-2003, 10:51 AM
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If I a reading this correctly....

There is really no difference in the way the two Alternators are Wired if you are swapping an internally regulated Delco 10 SI for an internally regulated "1 wire" Delco 10 SI.

There is a differnce in the way the regulators function and how the field is excited but "you can wire the 1 Wire the same as the 3 wire" and the 1 wire will charge just the same. Only in this case at a higher amperage. Make sure the charge wire to the battery is in good shape. And it should be at least a 10 gauge wire with a 100 amp alternator.

If you look at the wiring diagram at this link you will see what I mean.

Install the new alternator just as the old one was installed and your dash indicator light (if you have one) will work as it is intended to.

al

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Old 01-30-2003, 04:03 PM
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Thanks, Autorewrie. I should have waited for your answer but I got impatient and started guessing with jumpers. For a few minutes it charged fine then...nothin! I must have cooked something. Now I'm running on the old one (85 amp ) <img src="graemlins/pain.gif" border="0" alt="[pain]" />
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Old 01-31-2003, 06:23 AM
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No problem. You probably fried your diodes. Repair kits for alternators are one of the biggest bargains in the auto parts business. At leat they used to be that last time I bought one. Go to your local parts store and get a kit ($20?) which includes a new set of diodes, bearing, brushes and condenser and install it yourself. Easy and less than an hour job.
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Old 02-03-2003, 07:09 PM
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Thanks Willys36. I'll try it.
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Old 02-04-2003, 12:06 AM
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Try this page Here
Later,
WEIMER
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