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Flex
09-22-2007, 07:58 PM
Here's the problem. I installed one in my car last night. These mothers are larger than the stocker so I had to modify the bracket a little by grinding away two sections.

After finally bolting it in place I start the engine to have the battery warning light come on. I looked at the two alternators side by side. The 3 pin connector rests in the same place but the power post is up and to the right of the connector vs the stock down and to the left. There is also another single pin socket to the right of the connector on the new alternator between the 3 pin harness and the post.

Has anyone used one of these? Any idea why the warning light is on? Could it be related to the empty pin connector?

iceblue
09-23-2007, 12:52 AM
It sounds like you have thw same problem that I do. My alternator is a 200 amp 3G from Mr. Alternator. It charges just fine, but the light stays on all the time.

Flex
09-23-2007, 12:56 AM
Ice,
Mine seems to work fine too as the lights barely dimmed at idle with a 3.5 inch alternator pulley on but that damn light is on. Does yours have that single empty post as well?

iceblue
09-23-2007, 01:00 AM
Yes it does, but I do not know what it is for. Maybe some who has installed a 3G on the SC can be of some help with this. I know George has one on his car.

Flex
09-23-2007, 01:56 AM
Ask ole George if he has the same issue.

Super XR7
09-23-2007, 07:12 AM
Here is a pic of my 3G - mounted and wired.

The middle blue wire (harness is from a 94) goes from the plug over to the alternators single connector.

Mike

Flex
09-23-2007, 01:14 PM
Mike,

Great picture and thanks for the info. What is the blue wire for?

Super XR7
09-23-2007, 02:31 PM
What I remember is that it supplies 12V to the stator?? Normally the blue wire is terminated within the cable - so it actually went to nothing. I just pulled it out of the cable and connected it to the single terminal on the alternator. Look at your cars wiring diagram and you will see what is going on.

Good luck
Mike

blown94cougar
09-23-2007, 03:06 PM
That single pin connector you can get from advance autoparts is the field wire it connects to the white with black stripe wire coming from the big 3 terminal plug I didnt have to put one on my car 94's already have the 3G but I did do the swap on my 1983 mustang GT thats is why your light stays on I bet

Flex
09-23-2007, 09:01 PM
Just looked, my 91 only has two wires. The center wire is blank in my harness to the alternator.

Flex
09-24-2007, 02:25 PM
Hey guys a little more info. I only have two wires with the center slot in the connector having a plug. So there is no middle blue wire or a white with a black stripe.

Should I connector the center point to the empty connector slot?

Mike8675309
09-24-2007, 04:28 PM
On a 1993sc, there are 3 connections to the Alternator.
Wire #38 is Black with an orange stripe and carries the 12v, and has a gray fusable link along the harness somewhere.
This wire is connected to the rectifier.
Wire #36 is Yellow with a White stripe, and is 12v and It has a Blue fusable link somewhere.
This wire is connected to terminal A on the alternator that comes from the regulator.
Wire 904 is LightGreen with a Red stripe and is connected to the Dash Warning Indicator for the Alternator.
It is connected to the I terminal on the alternator that is connected to the regulator.

blown94cougar
09-24-2007, 04:36 PM
I think the problem is you dont have the 94 and up 3G alternator plug...your stock one will not work Mike8675309 should have you str8 on what wires go where now you just need the right plugs

Flex
09-24-2007, 07:09 PM
Mike,

My car is a 91. I do not have the center wire. How would I go about adapting a later harness to my current harness or can I?

blown94cougar
09-24-2007, 07:14 PM
here is a link for a fox body mustang...same alternator as you used to have this shows you how to upgrade to the 3G the wire colors and wiring are the same as the thunderbirds and cougars


http://www.racesystems.com/3gproj/

Flex
09-24-2007, 07:18 PM
Thanks bro, greatly appreciate the info.

Super XR7
09-24-2007, 07:27 PM
Doesnt your current alternator plug insert into your new alternator??

Mike

SCandelous95
09-24-2007, 07:45 PM
i need to git me one of there pretty shiny things...

been through 4 alternators in 2 years!! reman. sucks!

Mike8675309
09-24-2007, 08:02 PM
Mike,

My car is a 91. I do not have the center wire. How would I go about adapting a later harness to my current harness or can I?

I know that the alternator and wiring on my 90 is exactly the same as the one on my 93, so I think if you are missing a wire, that may be a problem. Was the alternator you removed a Mitsubishi brand alternator? Maybe someone already converted it to something else.

Flex
09-25-2007, 01:09 AM
SuperXR7,

Look at the pictures in the link blown94 posted. The alternators are different. While my harness plugs in, my battery warning light does not go out.


Mike,

No the alternator on my car is the same as my brother's 92 and any other SC I have seen. My harness just has a white plastic plug where the center wire in the connector should be.

I am going to go and have a look at my bro's 92 and see what his harness looks like.

Flex
09-25-2007, 01:18 AM
Just checked. My brother's 92 also has a plug in the center. Green wire red stripe on the right and yellow with white stripe on the left.

Flex
09-25-2007, 02:39 AM
Ok I went out and traced the wiring back from the fuse box. All three wires exit the power distribution box, but the blue wire disappears inside the corregated tubing before it gets to the alternator. I guess it must be tucked inside it somewhere.