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GM one wire alternator... What do I eliminate?

Posted: May 12, 2015, 10:03 pm
by cdc3jj
Sorry if this is an old topic. My dad said this was popular back in the day, and although I've been googling for 3 days I have yet to find a tech article that's idiot-proof enough for me.

I have a freshly built GM one wire alternator from a 52 styleline with the 216. It was rebuilt and run for maybe 100 miles before being garaged for the past 15 years. Swapped the motor so the alternator is available.

I have a 64 F100 with a 223 with the original generator. Mounting should be easy... Drill some new holes in the bracket and move it up to align the belts. All-thread through the bottom and make the top bracket work.

Wiring is where I'm fuzzy. And please forgive my lack of correct terminology. My dad says run the single wire straight to the battery. My question is about the voltage regulator since the generator is wired through the regulator. So I'll be eliminating the two little black wires and big yellow one...
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Then I'll take out this box since there's a charging regulator built into the GM single wire...
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I'm guessing this is a fusible link? Also history...
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And now finally, the voltage regulator. At least I think that's what it is.
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Looks like right side is positive and left is ground. Not sure what the two little guys on the front are for.

So will I run my charging wire from the alternator to the positive side or just straight to the battery cable? Does it make a difference? Seems like there's power already going to this box. That yellow wire is the same one hooked to the current generator right?

Thanks for clarification. I'm still learning how all these gadgets work.

Re: GM one wire alternator... What do I eliminate?

Posted: May 12, 2015, 10:13 pm
by ICEMAN6166
this is your horn relay, do nothing to it
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the wire from the alternator goes on the right hand post along with the yellow to the horn relay and the wire to the fuse block and ignition switch, and the + battery cable
once you remove the generator wires at both ends no more power is in the wires same with the voltage regulator

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i just taped up the not needed wires to the rest of the harness.

Re: GM one wire alternator... What do I eliminate?

Posted: May 12, 2015, 11:19 pm
by LM14
All you will need from this picture is the yellow wire if you decide to re-use the old wires. The small wires will not be used. The big yellow will attach to the single post on the back of the 1 wire alternator.
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This is your voltage regulator, you can get rid of it. That is the other end of the big yellow wire from the generator on the "ARM" terminal. If you plan to re-use the wire from the generator to the regulator it needs the end changed to an eyelet terminal. I would suggest a new heavy gage wire and not to reuse the old wire.
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This is your horn relay and is not a player in this whole process. Don't mess with it.
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This is your starter solenoid. Your wire from the back of the 1 wire alternator goes to the big post that has the battery cable run to it (I would assume the one on the right, the red cable, goes to the battery). The other big cable (I assume the black one on the left in your picture) would run from the starter solenoid to the starter itself. Just be sure the new cable from the stud on the back of the 1 wire alternator goes to the same terminal on the starter solenoid that the cable from the battery hooks to and NOT the side that actually hooks to the starter.
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You are going to lose your dash light. You also need to tape off any wires you bypass with his change so you don't get shorts. I prefer to cut the wire loom apart (get the tape off the outside so you can see the wires) and actually remove un-needed wires. I also prefer to put a new wire from the alt to the solenoid so you have the proper length.

If you google "hookup for 1 wire alternator) you should find enough reading to keep you busy for 4 or 5 years.

Good luck,
SPark

Re: GM one wire alternator... What do I eliminate?

Posted: May 13, 2015, 4:28 pm
by unibody madness
The delco remy s10 also known as a one wire in fact works better using the three wire approach. try a search on here under:
"need three wire alternator help from electrical gurus"
This post will help with your installation.