Hey Dave...
I'm not sure what alternator configuration will be on an '04, but I do know that it will be a Denso unit---likely a 124 amp. If it is the one I am thinking of, we can supply you with 180 amp for about $400.00(C/W upgraded output cable). However, it would be a good idea to see your unit, as it may not be the same- in which case we could convert your own.
Warranty is 1 yr..... but remember-really good alternators still make lousy submarines!!! Give us a call or better, come by and show us your Jeep! 250-2845 Bay 4 1222 40 Ave N.E.