I replaced my starter, and my alternater. My radio and gauges turns off while driving, for 15 secs then turns back on. Its not a loose connection or a ground wire. My alternater was rebuilt, the starter was new. I have not changed the battery its the original, but it was tested.
I had the same problem on my Dodge Caravan. When driving, all of a sudden the gauges would flake out and all the dummy lights would come on but car would remain running. Checked the battery and the alternator, both were fine. I finally figured out that it was the battery. Funny, the post that goes inside the battery had come loose. I was able to pull it out. Once I replaced the battery, the problem went away.
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It could be a faulty alternator. This would cause a battery drain since the alternator would not be recharging the battery and supplying operating voltage to the vehicle. Once the battery dropped to about 8 volts then the gauges, A/C, radio and other electronics would start acting crazy. Eventually the car would have shut down, but since you stopped at the post office, that didn't happen. With the battery being so low in charge, that would not allow the car to restart, as there would not be enough current to engage the starter properly. Check the battery voltage. If it seems ok (12-13 volts), try checking it again with someone trying to start the car. A normal battery will see some voltage drop, but a drained one will fall to almost zero with a starter load. Since you have gauges and not warning lights, a discharging battery may have gone unnoticed. If you determine the alternator is bad, be sure to have the battery charged, or if necessary, replaced before using the new alternator. A low battery can cause a new alternator to fail and most alternator warranties will not cover this type of failure.
Do you have a CD sitting in the radio? If so, find the radio fuse and pull it out for 20 secs and turn the car to the on position and wait 20 secs. Turn the car off again and put the fuse back in. Wait 10 secs and turn the car back to the on position and hopefully the radio will power back on.... some Radios get really picky if a CD has been sitting inside for too long...it worked with a Volkswagen so I don't know if it'll work with a GM... worth a shot
The vehicle could have a faulty ignition switch, the computer could be damage. There could be a loose ground wire. The fuses could be blown . The starter relay fuse in the engine compartment could be shorted . I would try and take the vehicle in to a local mechanic to diagnose.
check in the fuse box on the drivers side under the hood. Check for "display lights" or "Dash" maybe even under "ACC".
For the signals check for "turn signals" or "Lights"
Should be 15 and 20 amp fuses.
Replace those and everything should work.
If you cannot find the signals and other things in the fuse box when checking the diagram, then look at all the 15 and 20amp fuses by pulling them out with needle nose plyers. Whichever fuses look cracked, snapped or burnt should be replaced. You could pick up a pack of fuses at a gas station or autoparts store for about $2.99