Question on a grand cherokee

[specialkeay]

:dunno: My old ladies 99 grand cherokee is acting wierd, the radio will turn off then back on, the power locks only work sometimes and the windows, the speedo will spike and the headlights will dim and then brighten. I thought it was the alternator so I put a new one in and that din't seem to fix it, and I checked the new one with a multimeter and it putting out about 13.70. So I'm open for suggestions

[jimoshel]

Sounds like the worst kind of problem, Intermittent short . Check the dash VM, if you have one, and see what it does when this happens. If you don't have one then hook a voltmeter up where you can see it while driving. If the voltage drops you have a short. If it stays the same or maybe go up slightly you have a open. This will at least give you a clue as to whats happening. Start at the battery. Visually check every wire looking for loose connections, worn or bare insulation. Have the radio and lights on so you can see, hear when the problem happens. Grab, pull, twist, push and shake every wire and wire bundle and plug and connector you got trying to initiate it. Good luck, your gonna need it. Let us know what you find.