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Discussion Starter #1
Is it possible to drive the alternator field with MS?
or will I have to wire in a external regulator or swap to a 1 wire chevy alt??
thanks for any info.
 

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as Matt says, theres no current support for the alt, you better get a 3 wire external regulator, it came in the 80's Dodge pickups.



You just need to wire switched +12v, ground, and the signal for the alt.. thats it ;)
 

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+1 on the 3-wire regulator. i ran one with my Megasquirt for a year or so until i switched to the correct alternator for the 24v which was internally regulated. All you have to do is put switched 12v to two of the 3 wires on the regulator and wire them to the filed control wires on the alternator. (use the manual to figure out which ones those are as there are 2 diff. alternators IIRC)
 

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Blue wire is field positive, green is field negative. The regulator you can use is 1987 Omni/Horizon, these were the last carbureted ones. The reulator plug can be purchased from NAPA or get it from a junkyard. One of the regulator wires is blue, this is the voltage sense and taps into the blue field wire, the other is green and goes to the other field ternimal (no other connection in this circuit). The regulator grounds through it's mounting, so bolt it down tight! This will give you a stand alone regulator.
 

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Discussion Starter #6
Ok thanks for the info.
seems easier to toss in a regulator than even mess with it any other way.
I'm putting MS on a 89 caravan and plan on using a Programable intergrated circuit to drive the IAC stepper motor.
 

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External voltage regulator "fix"

Blue wire is field positive, green is field negative. The regulator you can use is 1987 Omni/Horizon, these were the last carbureted ones. The reulator plug can be purchased from NAPA or get it from a junkyard. One of the regulator wires is blue, this is the voltage sense and taps into the blue field wire, the other is green and goes to the other field ternimal (no other connection in this circuit). The regulator grounds through it's mounting, so bolt it down tight! This will give you a stand alone regulator.

Can anyone show a diagram about how this all gets wired
up. I know this is an amateur question, but I've been
having charging issues and the previous owner of my car
has done this external regulator work-around. I just want
to check and see, and probably re-wire this "fix" so I can
get my car acting right again.

There has been some discussion about it here:
http://www.turbododge.com/forums/f4/f60/173764-where-my-voltage-regulator-2.html#post1397375

Sorry about hi-jacking this thread, but it would be
beneficial to a lot of people to have this explained in more
detail to work from.

BTW, what part of Alaska are you from 86LaserXE-XT?
I live in Fairbanks, small world.

Thanks,
-D
 

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Discussion Starter #8
Well when I get around to wiring up my altenator I'll draw up some diagrams and such.
right now I'm nowhere near having it running.

and I live in The Valley heh, only about 300 miles from you :) small world but big state.
anyhow nice to see another Alaskan on this board, if your near the dragstrip this summer you might just see me there tearing it up in a turbo minivan.

I bet it feels like hell's frozen over for you there. it's -28 outside here right now. and last I saw for fairbanks was -44 OUCH!
 

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as long as you wire the two field wires to the regulator and bring 12v into the field wiring, it will regulate the alternator.
 

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Well when I get around to wiring up my altenator I'll draw up some diagrams and such.
I would greatly appreciate that. I have some diagrams
and got the instructions when I bought the new regulator,
but I just want to hear from others exactly what they did,
with pictures, so I know I use the correct wires and all. I
think the previous owner that did it kinda half-assed it.
I'd like to go through and do it over and use better gauge
wires and solder and heatshrink all the connections. Right
now it's twist and tape. I think I'll go over the grounds
again and really clean them up with a wire wheel and
make sure they connect solidly.


I bet it feels like hell's frozen over for you there. it's -28 outside here right now. and last I saw for fairbanks was -44 OUCH!
Yeah, it's about -32 at my house right now. This time of
year I always ask myself why I still live here. Summers
usually make up for it. This summer didn't though, the
weather was terrible this year.

It's a big state, yes, but it still has a small feeling to it. If
you run your car or van, you should let me know. I don't
get down to the Anchorage area very often, but if there is
a motor sports event I'd definitely try to make it.

By the way, there is a LaserXT for sale in Anchorage right
now. I saw it today on Craigslist.
LASERXT(Turbo) Daily Driver for Sale Good on gas Too 30 mpg
 

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as long as you wire the two field wires to the regulator and bring 12v into the field wiring, it will regulate the alternator.
I don't want to keep sounding ignorant, but the way it's
wired up now, I don't know what is what. The person who
wired it up used the same color wire for all the connections
so without knowing what is what to start with I'm going
about it blind. I guess the main thing I need to know is
what wiring needs to be spliced out of the original power
module, then how the wiring gets routed to the external
voltage regulator.

Again, I apologize for asking for all the help. I am not
mechanic nor am I an electrician. If it doesn't work when
I plug it in, I'm at a loss for options. Ha, that sounds
pretty pathetic. Anyway, thanks again for helping.
 

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I don't want to keep sounding ignorant, but the way it's
wired up now, I don't know what is what. The person who
wired it up used the same color wire for all the connections
so without knowing what is what to start with I'm going
about it blind. I guess the main thing I need to know is
what wiring needs to be spliced out of the original power
module, then how the wiring gets routed to the external
voltage regulator.

Again, I apologize for asking for all the help. I am not
mechanic nor am I an electrician. If it doesn't work when
I plug it in, I'm at a loss for options. Ha, that sounds
pretty pathetic. Anyway, thanks again for helping.
Its simple... i dont know if all the alternators have the same cables/conectors, at least the one I have has only 3, the big one (4AWG) its grounded so obviuosly is ground, the other big one goes directly to the battery, and the othe cable (14AWG i think) its just signal so it will have to be wired to the regulator,

The regulator has 3 terminals, but you will use 2 (one is signal from the alt, and the other its switched 12+v).

try to do the wiring and if you have more doubts just post'em along with pics.

Once its all wired you can see if everything its ok when the car is on and the voltage in the battery is more than 13volts (usually 13.8v)
 
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