The number one cause of intermitted gauge failure, acompanied by a no start is the ignition switch. The switch is a known issue with the second generation s/t series vehicles, and of those years 1997 was by far the worst. From my experience troubleshooting them, nearly 90% of 1997 Blazers, Bravadas, Jimmys, S10s, and Sonomas have needed an ignition switch replacement for various reasons. The switch can cause issues with anything routed through it, another one of the more common problems that can be caused by the switch is erractic/intermitted transmission shift problems. I will attach a link to the replacement procedure. Look for "Ignition Switch Replacement" in the links to the right.
You have a problem with the charging system, probably a bad alternator.
did you check your battery and alternator?
is your battery Low or poor?? Charge your battery on slow charge for 8hrs to give it a good deep charge, Installing an alternator on a low or dead battery will ruin it and also not charge your battery properly.. An alternator is not a battery charger its a battery maintainer!!
An alternator from a 2000 Chevy blazer will fit a 2002 S10 blazer with a little fabrication.
The alternator only needs to be replaced when it fails. Its not a part that needs to be changed during routine maintenance. If it ain't broke, don't fix it!
You could have killed some or all the cells in the battery. You need to replace both battery and alternator at the same time. I had the same problem. After I replaced both I've had no more problems. Take battery and alternator to auto Zone or Advanced Auto so they can test them. Buy new battery and alternator if needed. Fly wheel (Not sure what it is really called) where starter goes could be bad causing starters to wear out.
sounds like a bad ground. a lot of the g.m. trucks have a poor ground set up. good luck !
generally that you have an electrical issue, either your battery is dead or dying, or it could be your alternator also... make sure you have booster cables in your vehicle
Had the same problem on two occasions with my 99 Blazer...sounds as though your alternator is going bad. The car will run good while the battery is charged up, but as the battery wears down, the engine will run poorly and the gauges will operate erratically. Eventually, the battery will not have enough energy to allow the engine to run, and it will stall.
take off the belt unplug the wire connector form the back of alternator take the nut off the back of the alternator that holds the wire that is connected to the positive battery terminal and take the two bolts on the bottom of alternator that holds it to the engine
The alternator is on it's way out.
1st remove negative battery cable from battery. then remove electrical connectors from alternator with ratchet, rotate tentioner pully to remove belt. (near top/center of belt) remove support bracket and mounting bolts and it's off.