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Message: <blockquote data-quote="macuser27" data-source="post: 1423805" data-attributes="member: 21874">Hello there,I have a 1999 Mustang GT and have the battery warning light coming on and off intermittently for the past 3 months or so.Alternator was replaced 2 years ago and battery less than 1 year ago.Car starts up and drives just fine and never had any issues until today.This morning when I went to put the key into the run position, I noticed that all the analog dials swept to the max position and back to zero. Car starts up just fine. I drove it about 1-2 miles and parked.Came back to the car, key into run position and the dials swept through again. But when I tried to start, the starter clicked and loss all power to the car. No dome lights, no trunk lights, nothing. Like there wasn't a battery in the car.Popped the hood, and disconnected the negative cable from the battery. I reconnected the negative cable to the battery and the power came back on in the car. Key back in run position, dials sweep and car starts up just fine.Drove another 1-2 miles and parked for about an hour. Went back to car, key in run position, dials do not sweep and starts up just fine. Drove 3-4 miles and the battery warning light came on for a bit, then went away and came back on again.From my Google search, I found a lot of people saying to "check the grounds". I really don't know what that means.Any ideas? Help! Thanks a bunch.</blockquote>