1993 LX 5.0 Battery charging problems? Help

Ok I have had this car for about 2 weeks everything has worked perfect. Last wednesday I cranked it up and my voltage meter in the car wasn't reading anything. So I had the alternator and battery checked both are good. I replaced both plugs on the alternator and I replaced the fuseable link by the battery. Still not charging my battery whats up? Help I dont know of anything else to check. Car cranks up and runs fine as long as the battery will crank it or I have to jump it off then it runs fine. Checking the ground was mentioned to me but thats it I'm out of options.
Let me know what you think. I really want to get this fixed.:shrug:
 
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I know there is a resister on the backside of the instrument cluster that completes the charging circuit (w/out it even with working alternator battery won't charge) maybe something got toasted there, might explain why the gauge went dead too.