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So after cleaning all the cables and connectors, testing everything I could think of, I finally took it into my local Auto Electric shop. Turned out to be the Alternator. I didn't test this because I had just replaced it 3 months prior. Figured I could rule it out. Nope. Brand new NAPA...

Always hate when nobody follows up on there posts. Practice what you preach. This was indeed the CPS. As a result, I keep a spare in my jockey box. This little SOB will leave you stranded anywhere.

I quit buying the yellow tops. My CJ ate those things up. I thought they would be best for the winch. I have had excellent luck (so far) with the blues with winches. I too have gone to NAPA batteries and parts in general for that matter. I will only go to AZ, O'R, etc. for oil and paper towels.

Today I'm going to take a closer look. Makes sense the voltage would spike if there is a bad ground or fault somewhere. I bet you would bet me on the main cables.

I am suspicious of this being a grounding issue. By codes are you referring to the check engine light error (OBD-II) codes? I'm not getting any. I saw someone mentioned scanning the BTS via the OBD. Perhaps I need to understand my reader better. See what it will see while the engine is running.

That was fully suspected early on. So I swapped in my brand new spare PCM. Didn't make any difference. Both PCM's are telling the generator to output over 19v to the charging system. Thinks it has some great load. Also when I load it down with everything I got. The gauge will center out. Ass...

Did the voltage tests (post 2 post, running idle) read proper on that yellow? I do have a blue top. But it's showing 12.7 P-P. Maybe I'll swap out a newer red I have in the CJ to see if that makes a difference.

Tim, Thanks for the check list. I have confirmed most of these already. Not long ago I replaced all my heavy gauge cables. In general I keep my rig well maintained. I'm always being accused of having to "clean of a Jeep" :-) CLS, I have not been driving the XJ in fear of burning up circuits. In...

I should mention that the voltage test at the battery while running is consistent with the gauge reading. 14.2v upon start, 19.3v when acting up. Which makes me think the gauge is OK and reliable.

Was this resolved? My '97 XJ has started the same bad behavior. I've tested everything. Battery good at 12.7v, BTS draws 9k resistance (fairly new also), all connections good and clean, new alternator 3 months ago. I disconnected my winch cables and compressor circuits to eliminate any issues...

I'll check the CPS and confirm as it has been highly recommended. Even though it's been changed recently, seems these are gremlins. New to the XJ and MPI systems so appreciate the replies. Also have an '82 CJ-7, 258 w/ Weber. Mostly stock except for T-18 and Upgraded 300. Lot's of OJT prior...

Newbie XJ owner stumped. 1997 XJ 4x4 Auto, 4.0 I-6. Nicely modified. She has run like a champ up to now. Loaded up to go camping one Saturday. Moved it around in the driveway for loading. Started up and was running fine for engine warm up. All set to head for the hills. Turned engine off to...