Got it !!!!! You too can do the 136 alt mod on your older XJ and you won't believe the difference!!
It's not a direct bold on like the 93 and up xj's, here is what you need:
(this is just an add-on to the 136 amp alternator mod that is in tech tips so you old xj owners can join in) http://www.bc4x4.com/tech/2004/jeepalt/
97 or 98 Dodge 136 amp alternator serial # 56027913
Alternator bracket from a 93-98 4.0 engine (I had to grind the bracket some)
Alternator belt from a 95 xj
External voltage regulator for a 1985 Dodge puck-up
14 or 16 gage wire
#8 nuts (attach the wires to the back of new alt)
sever little wire connectors
The new alt is hard to get in, not much room. I had to attach my alternator to the bracket and put in both at the same time.
Wiring in the voltage regulator....
You have two small wires running to your old crappy alt (not counting the big wire that runs to the battery), one is from the switch and supplies 12V with the switch on. The other goes to your light/gage. You'll have to cut the old plug off and put on the round connectors on each wire.
The voltage regulator has two pins, (Advance auto part # VR295). Run a wire from the VR center pin to connect with the existing small 12V wire, attach both to the bottom alternator terminal with a #8 nut. Run a wire from the other VR pin to the other alternator terminal and stick the existing light/gage wire on with it, attach with a #8 nut.
In a nut shell, your two existing alternator wires will attach to the new alt plus two new wires from the VR. Just make sure the center pin in the VR attaches to the wire that supplies 12V. Matter fact my VR came with a wiring diagram
I mounted my VR on the fire wall near the battery. I also ran an additional small ground wire from a bolt that holds the VR down to the alternator. Everything I read says grounding the VR is very important.
Several parts to buy, check prices and make sure it isn't cheaper to upgrade your old alt.