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Old 02-19-2007, 03:06 PM   #1 (permalink)
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G1 alternator w/ external regulator wiring

Working on the truck in my sig, I replaced the alternator and while putting it together, I realized that the T-shaped plug that goes into the top of the alt only has 1 wire in it, going to the field. Plus, I pulled the loom off the harness coming from the regulator/etc on the passenger fender and it looks to have had some previous owner splicing and such going on. Does anyone have a wiring diagram for the charging system on these setups?

I have the Moosestang/Agnem diagrams printed out, but this shows an alternator with internal regulator. I have the external one. Thanks for any help guys!
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Old 02-19-2007, 07:43 PM   #2 (permalink)
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Re: G1 alternator w/ external regulator wiring

The other wire is used on gasser applications to send power to the electric choke. It is not used on diesels.

86 has the internal regulator, someone swapped an older alternator or maybe a whole older motor.
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Old 02-19-2007, 09:25 PM   #3 (permalink)
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Re: G1 alternator w/ external regulator wiring

Door tag is 4/1986, maybe it was one of the last to get it. Still, is there a wiring diagram for say 1985 model year out there anywhere? My local auto electric shop sold me a neat aftermarket regulator that plugs right into the top of the alternator with a little box on top that has a regulator in it, and 3 wires coming out, one for ground, one for B+, and one for a low voltage indicator light (don't have one on this truck). My only remaining question is what wire going to the regulator gives signal to the ammeter in the dash. I'm sorry if these are dumb questions, I've never been much of a charging system expert.
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Old 02-19-2007, 09:45 PM   #4 (permalink)
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Re: G1 alternator w/ external regulator wiring

The ampmeter doesn't work off the regulator - There is a shunt circuit parallel to the main (large) charge wire.

Don't expect that ampmeter to do much, it takes a pretty large charge or draw to make them move at all.
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Old 02-19-2007, 11:06 PM   #5 (permalink)
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Re: G1 alternator w/ external regulator wiring

Ah ok, I was kind of wondering about that, I saw the shunt you are talking about in the harness and wondered where it went. Thanks for all the help.
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Old 02-20-2007, 07:02 AM   #6 (permalink)
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Re: G1 alternator w/ external regulator wiring

My 86 has the external regulator on the passenger fender-well and the wiring harness appears to be stock. The 3 times I have picked up alternators from 3 different NAPAs they have always handed me ones for the external regulator. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 02-20-2007, 08:32 AM   #7 (permalink)
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Re: G1 alternator w/ external regulator wiring

I don't know, maybe it's based on amperage, having or lacking A/C etc... Or maybe they changed sometime in the 86 model year.

I know when I worked on the line at Ford we would use up an old part and you'd get a new crate with a redesigned part..... Could happen any old time.
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Old 02-25-2007, 07:14 PM   #8 (permalink)
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Re: G1 alternator w/ external regulator wiring

It was a running change during the model year, my diesel has an external regulator, while my gasser has an internal, build dates are a month apart(that's all I remember tho... LOL) Both have towing and camper packages, and A/C.
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Old 02-27-2007, 06:20 PM   #9 (permalink)
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Re: G1 alternator w/ external regulator wiring

my 91 has external, all factory wiring. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 07-01-2009, 09:04 AM   #10 (permalink)
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White STR wire on diesels

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Originally Posted by Mr_Roboto View Post
The other wire is used on gasser applications to send power to the electric choke. It is not used on diesels.

86 has the internal regulator, someone swapped an older alternator or maybe a whole older motor.

So, provided a person has an external regulator on an '84, will an alternator work without the STR wire being hooked up at all? It appears that in my '84, the white/black wire comes from the T connector and travels back to a loom connector, then stops. It looks like it came from the factory this way. All other wires are in place and external regulator, with only three wires, is in place, but the alternator doesn't charge. (I don't have the original alternator and this one has never worked from the time it was installed by the owner of the vehicle.) My suspicion is that the voltage regulator is simply not working. I get voltage to it from the ignition switch (green/red wire) and voltage from the battery (yellow wire, which also parallels to ammeter,) and the orange wire going to the FLD terminal is grounding through the alternator which does work on a test bench...but the system does not charge and the FLD terminal remains neutral as the engine is running. Again, the STR terminal from the alternator is going nowhere by means of the factory wiring since there's no ECM to feed a choke signal to....
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Old 07-01-2009, 06:10 PM   #11 (permalink)
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ps use the low voltage just run it into the dash to a led they can be bought at a truck stop running 12v
that would be a cool mod
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