4.0 swap alternator wiring - JeepForum.com

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post #1 of 33 Old 03-17-2013, 06:08 PM Thread Starter
Gigemags05
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4.0 swap alternator wiring

Im using the hesco wiring harness.

Anyone familiar with how to wire the 4.0 alternator?

I've tried logging into their forum but my membership still hasn't been activated.


There is one blue wire and one brown wire coming from the PCM that do not have labels and I can't figure out where else they'd go. Do they go to the field terminals on the alternator? If so, which is which?

Also, is there a ground anywhere?


Y'all have helped a ton the past few days, I really appreciate it.

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post #2 of 33 Old 03-17-2013, 06:17 PM
SLO_Ken
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Here's a pinout diagram for a 97-99 pcm. Maybe it'll help?
Attached Thumbnails
98_4.0_PCM_pinout.jpg  
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post #3 of 33 Old 03-17-2013, 08:34 PM Thread Starter
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Thanks for the pin out. I'm not sure if it'll help, but I'll study on it some.
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post #4 of 33 Old 03-18-2013, 12:02 AM
wrongway92407
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The Hesco harness was made to use with there MPI. I just pulled out my alt to day but haven't gotten to the point to figure out the wiring, but will take a look tomorrow.

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post #5 of 33 Old 03-18-2013, 08:57 AM Thread Starter
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Ok cool. If you get a chance, let me know what you find out.
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post #6 of 33 Old 03-18-2013, 01:28 PM Thread Starter
Gigemags05
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I just spoke with Bennie at hesco. He told me the blue wire goes to one of the field terminals and the other field terminal needs 12 volts. Does anyone know which field terminal needs the 12 volts?

Also, the brown wire is for the neutral safety switch. Does anyone know where that is on a 1980 cj7? How do I hook this wire up to that??

Just when I thought I was getting a handle on this stuff...
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post #7 of 33 Old 03-18-2013, 02:00 PM Thread Starter
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I have a tf999 transmission btw.
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post #8 of 33 Old 03-18-2013, 07:26 PM Thread Starter
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Anyone have any idea where this wire for the neutral safety switch should go?

I've been looking through the fsm but can't find anything about where the wire would go.

Would this wire connect directly to the switch? If so, is the switch located on the steering column? Or does the wire connect to somewhere on the transmission?
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post #9 of 33 Old 03-18-2013, 07:48 PM
SLO_Ken
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That wire needs to be grounded for the starter relay to work. The neutral safety switch provides that ground when the transmission is in "Park" or "Neutral". I suspect the switch is near the base of the steering column under the dash, but I'm not familiar with auto CJ's.
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post #10 of 33 Old 03-18-2013, 07:58 PM Thread Starter
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So for it to work properly, I need to connect it to the switch? I'm seeing some things that say its on the tranny and others saying its in the steering column.
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post #11 of 33 Old 03-18-2013, 08:49 PM
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Quote:
Originally Posted by Gigemags05 View Post
So for it to work properly, I need to connect it to the switch? I'm seeing some things that say its on the tranny and others saying its in the steering column.
Yup. If the wire is not connected, the starter will not work. The wire should go to the center pin on the NSS.

Here's a pic

and a thread...
http://www.jeepforum.com/forum/f8/84...crank-1393132/

Or you can just ground that wire, then the starter will work regardless of the gear selector position.
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post #12 of 33 Old 03-18-2013, 09:04 PM Thread Starter
Gigemags05
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Thanks! I just went out and checked and I found the nss on the transmission.

Next question: the switch has a connector attached to it already. I don't want to pull the connector because it has the back up lights attached to it.

But I do want to attach the wire from the harness. Can I just splice it in to the middle wire? What's the best method for this? Seems to be in a relatively unprotected place.

Or, will I be able to pull just the middle wire from the switch and replace it with the new one?
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post #13 of 33 Old 03-18-2013, 09:19 PM
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Yeah, I'd splice into the existing wire. I don't know if there is a "best" method. Use your best judgement.
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post #14 of 33 Old 03-18-2013, 09:39 PM Thread Starter
Gigemags05
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Alright, awesome. Thank you very much.


Anyone have any insight on which terminal is which on the alternator?
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post #15 of 33 Old 03-18-2013, 10:50 PM
86cj74.2L
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In the PCM pin out look for the two wires labeled generator field - and generator field source + those are your field wires.
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