Hi. I'm back in the jeep game, after a bit of a break. My 96 grand cherokee, 4.0 litre, all stock so far, started having greif starting in the cold. I replaced the battery, as it was pretty old, and was losing charge when it sat for 2 or 3 days.
Then, about a week after replacing the battery, I started having some grief with an intermittent no charging issue (according to the guage, anyway). I couldn't ever catch it in the act to see if the voltage was actually falling off, or if it's just a guage thing. I replaced the alternator with a new bosch unit just to be safe, as I do take it on some pretty long highway trips - and the fault is still present!
Every once in a while, the guage will drop to the bottom, and the check guages light will come on. This can happen when sitting at a light, or when driving around the city. It can go on for over a minute, or sometimes clears itself up within a few seconds. By the time I pull over and pop the hood, it's back up again! I've been driving around for the last week with a voltmeter on the passenger seat, just waiting to test it, but no luck. Any suggestions?