Look at the last pic I posted

 

Your belt "looks fine", or your belt IS fine? Just looking at it isn't going to tell you. You need to get in there and verify you don't have a seized pulley, a bad bearing, and that your alignment and tightness is good. That squeal could be a power steering pump, a slipping or loose belt, or something seized. Think about it: if your belt is slipping on the alt pulley, do you think you're going to get a solid voltage reading? These checks are simple, and I feel you should be doing them BEFORE you go screwing around with wiring. You may be opening a whole new can of worms by doing so. Also...do you have a FSM? If not, get one. It will have all the schematics you need, and you will be able to properly diagnose what belongs where, and what doesn't. Don't get a Haynes or Chiltons, get your year specific FSM. You can find them online for under $10, or sometimes even for free.

 

Ok yeah gonna do all that.the wiring I just made safe since the dude was using those house plastic twist caps
I also notice on the wires was another wire brass attached to both then to copper.was not factory and did not look safe. But now im finding more **** like this vacuum line does it go into one of the intake manifold holes

 

Btw when my airs on voltage drops a bit I kept it on to see and rev it and it still sky rockets and check gauge light comes on

 

dude it sounds like either the belt is not right but more likely something is wrong with your alternator wiring. I haven't seen your other thread. I second roninofako but I also have another suggestion. Next time you see an XJ (preferably one that is known to be in proper working order like someone you know or something) stop them and look at their alternator wiring and or other stuff that you suspect to be out of order on your XJ.

 

This is why I say to get a FSM...it's all in there...that and a meter and you are on the right track

 

Yeah that's what I was thinking most guys including my brother.have older xjs I have a 99. Are they still similar to the 95

 

And yeah its gotta be the wiring causing this.in my other thread I was saying he had an msd ignition on that was pulled off by the previous guy but I think the wiring that was set up for is still mapped out for that.but the wires were spliced together between the alt harness .I would like ti just by all new wires but all I can find is the alt harness.there I still other wiring

 

Go take a peek at a junkyard.....maybe.

Get a meter. Best $10 you could spend.

Butchered wiring is a ***** to diagnose over the interwebs.

Never used a meter? Here's how:

https://learn.adafruit.com/multimeters/

 

Thanks man.I appreciate that and I will get one and do that.but how does that helpe determine how to rewire or tell me if its the wiring that is causing this.

 

Gotta eliminate the wiring issues. First.

The meter will allow you to test electricity which you can't see. Test for proper grounds, whether there's power where it's supposed to be or not.

 

All grounds I cleaned today.wiring is good got a wiring diagram from my boy that is a mechanic went over everything and wires are right.looked at my friends 99 and everything is connected the correct way.

It seems a tad better since i cleaned all grounds.the negative to the battery one goes to fender from battery.other goes from battery to ignition coil where other grounds are.

Now my belt squeals bad when you start gettting the rpms up. One I do know is the pulley on the alt is not tight enough. Belt needs replaced im sure even though it looks new still replacing.my alt was pretty hot for only having it run for 5 mins the engine wasnt even that hot yet. I really think my reg is fried from when the msd was hooked up which has a msd ignition coil also. I think it was to much power pushing and fried it. I know dont go by the gauge.but the guage is right I used a battery charger to see if the battery was charged at the rights volts everything was right. When the belt squeals is when the gauge flys up and gauge light comes on.its even dropped down to 9 before but without reving it stays right where its supposed to be.

Not sure if pics posted but thats where the negative went before I bolted it and my alt looks pretty beat

 

Alternator looks like crappola.

 

Haha yeah it does im replacing that turd along with a new belt this weekend.if that doesn't fix my overcharge problem then its gotttttta be my reg in the pcm. What alt do you recommend getting and the alt tested back at 15v

 

Heres the update.... Got a new alt and belt put it on.... still same problem. This time all my gauges went haywire moving around like crazy then on seconds back to normal. Still gettingthe same overcharge problem. Put my ear up to the battery and could hear boiling.so we tried my brothers battery who also has an xj. Same thing happened with the overcharge... so now its making me think its the pcm internal voltag2 regulator. So I open it up and all is good bang it around "getting another one anyways" just to see what happens. NOWWW for the weird stuff... hook the pcm back up and it wont start I flashed the computer also. Wont start wont start then starts ok everything seems good then I hit the brake while in park engine light comes on. Rev the rpms up my dome lights get brightttt as I rev more they get brighter. Turn air on and it stalls out only stalls out when I turn my air on. Now what they heck could this be...