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nothing wrong with the ECM unless it has the voltage regulator as part of the system
indicates faulty wiring and faulty alternator
have a load test done on the battery
have an auto electrician do a full charging system check
charging voltage should be 14.5-14.8 volts DC
battery voltage should be 12-13.5 volts dropping to 11 volts when cranking the engine
make sure that the drive belt tension is correct and the belt is in good condition
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.
With the jeep running put a volt meter on the battery and it should be reading above 13 volts if not replace the altinator it isn't charging.You can check the fuse for the altinator first if not charging but most likely the altinator is bad.
Put a volt meter on the battery itself and take a reading when it is doing that. If charge rate is over 14v the alternator may be working but the output is not being cut down to "useful voltage" You may have a regulator problem.
1) Check large fuses and relays in the box near your battery in engine compartment. 2) Jiggle the shifter repeatedly - the shifter and brack interlock switch is notorious for getting worn out and causing problems like this (happens to me evry 3-6 months) 3) Ignition switch cable assembly may be loose, or ignition switch may need to be replaced (let dealer figure this out).
This is basic, but first off, try to shift it into neutral, and try to start it. It is easy for the linkage to get out of adjustment, where it thinks the jeep is in gear. If that does not work, make sure you have battery power to the ignition and starter.
Have a shop verify the pressure is really low, it could just be the sending unit is defective for the oil press guage, but get it checked, if it really low you could burn out the bearing in your engine, a very costly repair.
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