Engine/trans swap problem with charging system - JeepForum.com
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Unread 06-25-2015, 06:34 AM   #1
Plyj
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1990 YJ Wrangler 
 
Join Date: Feb 2010
Location: Plymouth, MA
Posts: 77
Engine/trans swap problem with charging system

I just finished putting in a 4.0L from a '98 XJ into my '90 YJ - also added a 700R4 transmission. Everything appears to be working fine except the charging system.
I had the alternator checked and 2 separate Auto parts places and both said it was fine. The old alternator had a plug that just plugged in but the new one ('98) has 2 studs and is supposed to have some kind of connector that is bolted onto the back. I just connected the wires to the studs since I don't have the connector thing. Is there something else I should be doing here?

Old Alt:


New Alt:


Thanks

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Unread 06-25-2015, 07:25 AM   #2
fishadventure
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1991 YJ Wrangler 
 
Join Date: Jul 2013
Location: Morrisville, VT
Posts: 1,813
I think the 98 alternator used the computer for voltage regulation while the earlier one is internal. I think that might be the issue. Can't remember for sure. Others?
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Unread 06-25-2015, 07:39 AM   #3
jsawduste
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2006 YJ Wrangler 
 
Join Date: Jul 2006
Posts: 3,290
Quote:
Originally Posted by fishadventure View Post
I think the 98 alternator used the computer for voltage regulation while the earlier one is internal. I think that might be the issue. Can't remember for sure. Others?
Correct.
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Unread 06-25-2015, 07:53 AM   #4
Plyj
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1990 YJ Wrangler 
 
Join Date: Feb 2010
Location: Plymouth, MA
Posts: 77
That would explain it.
But since I don't have a computer on this vehicle (converted the engine to Weber Carb) can I just add an external regulator?

I still have the old Alternator but would have to pull the V-belt pulley and swap in the serp belt pulley which could be more work than just adding the external regulator.

Thanks again.
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Unread 06-25-2015, 08:01 AM   #5
fishadventure
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1991 YJ Wrangler 
 
Join Date: Jul 2013
Location: Morrisville, VT
Posts: 1,813
The pulley conversion's been done. That's what I would do.
In fact if I ever finish my project jeep the peripherals wil be similar: 98XJ donor to '91 YJ
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Unread 06-25-2015, 08:02 AM   #6
jsawduste
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2006 YJ Wrangler 
 
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Correct x2
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Unread 06-25-2015, 04:06 PM   #7
Plyj
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1990 YJ Wrangler 
 
Join Date: Feb 2010
Location: Plymouth, MA
Posts: 77
Okay... thanks.
Ordered the pulley from Powermaster (old alternator mfg) since I couldn't get the OEM pulley off the '98.
Figured I could sell the other alternator and didn't want to ruin it.
I'll have to make new brackets... no big deal since I had to make 'em to fit the '98 alternator - as you can see from the photo.

Took it out for a drive today (carried an extra battery just in case) and she runs superbly... what a freakin pleasure... cruisin' at 70MPH without any strain.
I love it.

Thanks
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Unread 06-25-2015, 04:09 PM   #8
jsawduste
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2006 YJ Wrangler 
 
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