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Author Topic:   alternator wiring
indyphil
Gearhead

Posts: 877
From: Lafayette, IN, USA
Registered: Jul 2002

posted 11-20-2002 05:19 PM     Click Here to See the Profile for indyphil   Click Here to Email indyphil     Edit/Delete Message   Reply w/Quote
I have traced a charging problem (no charging at all) to my alternator and am now wondering If i had it hooked up right. I had the field wire and battery wire hooked up to the appropriately stamped posts on the back of the alternator.

My question is where should the third wire go? There are two posts to bolt it to, the GRD post or the STA post. I have a black colored insulator remaining also. The third wire should be a ground wire, so it would seem logical to connect it to the GRD post. I dont have a diagram but i thought when i bought the car that it was hooked up to the STA post which is further away. And why would I need an insulator if Im just grounding the unit?

anybody got a picture of how theirs is hooked up? Or a diagram or simply some advice/help? My wiring diagram doesnt help.

I have an orange field wire
a thicker black battery wire (my diagram calls for black with white stripe) - the battery and field connections are held in a big plastic boot which makes them hard to get wrong.

and a black/red ground wire.

Ever since I owned the car the lights have been dim, and the ignition has been trouble (i have only owned it for a few months and hardly driven more than 100 miles) So i wonder if it was sold to me with the problem - only recently did I leave the lights on for an hour, and pretty much flattened the battery. Trouble is I also recently dismantled the alternator and may have reassembled it wrong then.

thanks in advance.
Im feeling pretty dumb
Phil

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Dave Gibson
Moderator

Posts: 7549
From: Norfolk, Virginia, USA M&M#166 MCA#47921
Registered: Aug 99

posted 11-20-2002 07:18 PM     Click Here to See the Profile for Dave Gibson   Click Here to Email Dave Gibson     Edit/Delete Message   Reply w/Quote
Phill,
What year stang and power plant are we talking about? I do have several different manuals, but I want to make sure we are talking about the same thing first.
When you get a chance check out the Jim Osborn manuals. They are awesome. I have a full set and use them all the time. Use the link at the top of the page to see them on line. If you decide to order any of the manuals, make sure that you mention M&M. It helps offset expenses for maintaining this site.

Dave & Terri

------------------
Poison Ivy (Dave's)
'65 Fastback Modified 289 4V, C-4, dual exhaust, styled steel wheels, rally pac, A/C
'02 Explorer XLT, Black, 3.73:1 limited slip, class III tow package!

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indyphil
Gearhead

Posts: 877
From: Lafayette, IN, USA
Registered: Jul 2002

posted 11-20-2002 08:35 PM     Click Here to See the Profile for indyphil   Click Here to Email indyphil     Edit/Delete Message   Reply w/Quote
Sorry I forgot to add my sig

Its a 68 C code (289 2V)

------------------
'68 coupe 289 C code
edel 600cfm carb, performer intake, dual exhaust

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Dave Gibson
Moderator

Posts: 7549
From: Norfolk, Virginia, USA M&M#166 MCA#47921
Registered: Aug 99

posted 11-21-2002 06:00 AM     Click Here to See the Profile for Dave Gibson   Click Here to Email Dave Gibson     Edit/Delete Message   Reply w/Quote
Phil,
I will pull out the osborn electrical manual and scan the alternator wirring for you and send it to you via e-mail. Granted it is for a '65 289, but it should do.

Dave & Terri

------------------
Poison Ivy (Dave's)
'65 Fastback Modified 289 4V, C-4, dual exhaust, styled steel wheels, rally pac, A/C
'02 Explorer XLT, Black, 3.73:1 limited slip, class III tow package!

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indyphil
Gearhead

Posts: 877
From: Lafayette, IN, USA
Registered: Jul 2002

posted 11-21-2002 06:12 PM     Click Here to See the Profile for indyphil   Click Here to Email indyphil     Edit/Delete Message   Reply w/Quote
Got it working this evening, predictably I put the ground wire to the GRD terminal. The STA terminal is not used on my configuration, but it does need the black insulator. I learned that the STA terminal means STATOR and is used in other applications. anyway the battery is charging and i get 14.5 volts now when the engine is running. The misfire is gone, but i read another post that mentioned tightening intake manifold bolts and found mine were not torqued up very tight so that may have helped also. Its wet outside so instead of "test driving" i just put the battery on charge. with snow coming I may have to wait till spring to take it for a spin

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