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sounds like a dead battery , try a jump start ,if it starts have the alternator charge rate checked as if low may have been the cause of the battery going flat, then recharge the battery with a drive of about 20 miles
I would ask the Pontiac mechanic and see what he recommend. They wont charge you nothing for that. If you don't get the right answer go to another garage and ask them.
use a digital voltage meter on the battery to verify the 'spikes', Jeep Wrangler gauges are notorious for being erratic (I have a 98 TJ, how's your gas gauge working?)-
the printed circuit board gets weird due to water leaks that find their way to the back of the pod from the top of the roof seal, so it is not unusual for gauges to act strangly.
If that is not the case, it is time for a new alternator.
Did you check the voltage after a drive or after it was jumped. The battery may need some time to recharge if it was jumped before it gets checked. Have you checked for a possible draw on the battery? This could be a reason it dies every once in a while. I think that the Alternater is on its way out, it doesn't sound like it is charging like it should. It the new belt tight enough(some new belts stretch after a short time)
If it only warms up to operating temperature and dies check the EGR Valve. It should be open within 10 minutes or so. If not the engine will die out although it will start after the engine cools down again
The interior light and ignition can not be related. Just coincidence.
The interior light has a 3 position switch, off, on with door switches, and on all the time. So either a door switch is shorted on, or the switch by the lamp is shorted to the always on position.
The ignition is weird but easily diagnosed. First check that the ignition switch itself turns on and off, by using a test light. If that is normal, then take out the ignition control unit and have a place like Autozone test it. It has a relay the ignition switch is supposed to turn on and off, and it could stick on, even after switch is off.
Did you remove battery cables while charging? Rmove and make sure grd is clean and tight Turn on the ignition, watch gauge. It should reset itself. If not, start engine and drive around the block. then make sure you park on level ground , then shut off the engine. Did that work? If not, disconnect the battery for a few minutes and hook it back up. Last but not leastm go put gas in your tank. It just might be full. Pranks have been known to happen. Good Luck.
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