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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 06-11-2008, 05:06 PM   #1
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Alternator Wiring

I want to rewire my stock 22re alternator in my 1993 2wd pickup and have a couple of questions. Can I wire the stock alternator up with one wire? I want to wire it directly to the starter. My truck is offroad only and I do not use any of the stock accessories.

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Old 06-12-2008, 09:48 AM   #2
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I am thinking you do not want to wire directly to the starter...but i may be incorrect?

Many of the Demo Derby guys run one wire GM alternators. As long as there is a lead going from the post to the battery, you are good.

BTW, that truck is sick!
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Hmmm, dunno. Ask the oem Nazi DC.
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Old 06-12-2008, 10:44 AM   #3
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Nice ride

You could run the larger wire to the starter how ever the other ones must also be used. The alternator is externoly (sp) regulated and with out the other wires there would be nothing telling the alternator to charge or stop charging. I don't remember what wire goes to what but I changed to a gm one wire and had to modify the harness so the battery would charge.
hope that helps.
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Old 06-12-2008, 11:09 AM   #4
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A 1993 is internally regulated
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Old 06-12-2008, 11:24 AM   #5
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Nice truck! This link helped me understand alternator wiring better:
http://www.autoshop101.com/trainmodu...or/alt101.html

It looks like to me the only wire you wouldn't need would be the one for the charge light.
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Old 06-12-2008, 02:16 PM   #6
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whats the specs on that 22re man? nice ride and yeah what they said is about it man
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Old 06-12-2008, 02:41 PM   #7
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Well what I wanted to do really was just run one wire from the alternator directly to the battery. I guess the stock toyota alternator is not set up to be wired like that. My alternator is not running right now and im sure it has something to do with the stock wiring. I think I will just ditch the stock alternator and go with a beefier GM one wire alternator.

The specs on the truck are:

1993 Toyota 22re 2wd
Custom a-arm's with King 2.5 " Coilover Shocks 13" Travel
62" Long travel deaver leaf springs with King 2.5" shocks 18" Travel
Fully caged front to back with 1.5 DOM
JD Fabrication Upgraded steering with new pitman arm, idle arm and center link
Fiberglass dash, race radio, intercom, parker pumper fresh air system, Lowrance Baja GPS
Autometer Gauges and Tachometer
Beard Ultra Pro seats with Crow 5 point Harnes
33 gallon Bronco fuel tank
33x10.5x15 BFG Baja TA's
Toyota 8" with 5.29's and spool
4 X Hella 500's on the lightbar uptop
2 X Vision X HID Lights on the bumper
Custom aluminum rear led light mount
Craftsman aluminum race jack with custom mount
Optima Yellow Top Battery

Im sure I missed some other stuff but I think that is most of it.

Last edited by bajaguy; 06-12-2008 at 02:47 PM.
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Old 06-12-2008, 03:09 PM   #8
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Doesn't that suck power from the engine by running the alternator in full charging mode all the time? Plus it will be over-charging that yellow top, something a deep cycle battery doesn't like.
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Old 06-12-2008, 04:55 PM   #9
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Doesn't that suck power from the engine by running the alternator in full charging mode all the time? Plus it will be over-charging that yellow top, something a deep cycle battery doesn't like.
Isnt the internal voltage regulator in the Alternator what keeps the alternator from over charging the battery? Either ways I just ordered a GM one wire alternator from Summit and a mounting bracket so it bolts right on the stock toyota alternator mounts.
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Old 06-12-2008, 06:09 PM   #10
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Isnt the internal voltage regulator in the Alternator what keeps the alternator from over charging the battery? Either ways I just ordered a GM one wire alternator from Summit and a mounting bracket so it bolts right on the stock toyota alternator mounts.
Did you read that link I posted above? The regulator won't work without the wires connected to it.
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Old 06-12-2008, 06:52 PM   #11
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you can't easily do a 1 wire installation.

you can make a fairly direct setup to allow the alternator to work. there are 4 connections to the alternator, and the alternator grounds through the housing. there should be 3 connections in one 'plug' and 1 connection through a stud on the alternator.

three connector plug:
-- 1 connection for charging system failure light uses 'differential voltage' to illuminate the light- when the alternator output falls too low or fails, the voltage supplied to the light flows forward through the diode to the alternator and causes the light to illuminate. The diode prevents voltage from the alternator from flowing backwards through the light and lighting it when alternator output is good.
-- 1 connection switched voltage from the ignition switch- energizes the regulator circuit so that when the engine is running the regulator can operate.
-- 1 connection fused from the battery (fused 40A, from constant on voltage)

the stud:
-- alternator output to the battery. (fused 100A or 80A based on alt output, also supplies fused connection above- it has its fuse inline)

All 4 of the connections must be made for the alternator to work.

I recommend going to the battery for the alternator output and not the starter due to resistance losses from the extra length of cable. if your setup has a disconnect on the hot lead to the battery (i've heard of things like this for roll-over or crash protection), then wiring to the starter is acceptable but expect a tenth or so voltage loss and use the largest gauge wire you can, at least 2AWG.

the drawing here shows the basic alternator wiring:
http://www.ncttora.com/fsm/1990-1995...i/charging.pdf

print it out. it has plug diagrams and fuse ratings listed. keep in mind it is a generic drawing that shows the wires for both the 4 and 6 cyl engines on one drawing. ignore the 6 cyl wiring.
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Old 06-13-2008, 09:20 AM   #12
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you can't easily do a 1 wire installation.

you can make a fairly direct setup to allow the alternator to work. there are 4 connections to the alternator, and the alternator grounds through the housing. there should be 3 connections in one 'plug' and 1 connection through a stud on the alternator.

three connector plug:
-- 1 connection for charging system failure light uses 'differential voltage' to illuminate the light- when the alternator output falls too low or fails, the voltage supplied to the light flows forward through the diode to the alternator and causes the light to illuminate. The diode prevents voltage from the alternator from flowing backwards through the light and lighting it when alternator output is good.
-- 1 connection switched voltage from the ignition switch- energizes the regulator circuit so that when the engine is running the regulator can operate.
-- 1 connection fused from the battery (fused 40A, from constant on voltage)

the stud:
-- alternator output to the battery. (fused 100A or 80A based on alt output, also supplies fused connection above- it has its fuse inline)

All 4 of the connections must be made for the alternator to work.

I recommend going to the battery for the alternator output and not the starter due to resistance losses from the extra length of cable. if your setup has a disconnect on the hot lead to the battery (i've heard of things like this for roll-over or crash protection), then wiring to the starter is acceptable but expect a tenth or so voltage loss and use the largest gauge wire you can, at least 2AWG.

the drawing here shows the basic alternator wiring:
http://www.ncttora.com/fsm/1990-1995...i/charging.pdf

print it out. it has plug diagrams and fuse ratings listed. keep in mind it is a generic drawing that shows the wires for both the 4 and 6 cyl engines on one drawing. ignore the 6 cyl wiring.
Great post! Thanks for the help guys. This forum and Pirate 4x4 are my one stop shop for my Toyota questions. I could rewire the stock alternator but just purchased a GM one wire 100amp one.
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Old 06-14-2008, 12:31 AM   #13
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Quote:
Originally Posted by bajaguy View Post
Great post! Thanks for the help guys. This forum and Pirate 4x4 are my one stop shop for my Toyota questions. I could rewire the stock alternator but just purchased a GM one wire 100amp one.
Thanks.

Anyhow, let us know how it goes with the GM alt.
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Old 07-15-2008, 12:33 AM   #14
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what intercom setup is that? how much did the setup cost you and where did you get it? Im building a toyota pickup right now hopefully to race in 1450.
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Old 10-23-2011, 09:04 AM   #15
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do u know what kit u got
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Old 10-23-2011, 09:05 AM   #16
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do u know witch kit do u have
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Old 08-25-2012, 08:36 PM   #17
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Anyone know why my alternator isnt. Harging my battery? Every single fuse is good but I check the connections where the fuse goes with a test light but its not receiving power on the bridge. This happened overnight, I woke up and found this out when I checked the volt meter. By the way its a brand new alternator
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Old 08-25-2012, 08:36 PM
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