: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