Have Jeep Questions? Ask a Jeep Repair Expert for Answers
Hello and thank you for using Just Answer
sounds like your alternator may have gone out
this will cause all the lights to come on because voltage is low and will also explain a no crank
have you put a meter across the battery? you should have around 12.5 volts
also have you tried jumping it with another vehicle?
let me know
if jump starting it worked
you either have an alternator that is failing intermittently or a high draw on the starter
I would suggest you have the battery load tested when it won't start
sometimes alternators will test ok but when installed and get warm they can fail
I would put a meter across the battery and run the truck with the high beams and blower on high and see if the alternator maintains over 13.3 volts
the alternator is best tested on the vehicle
Hooked everything up and ran the car like you said....when I started, the alternator was charging @ 13.30 volts....after 15 minutes it's down to 12.75. Does this confirm that it's a failing alternator?
yes the alternator should not drop bellow 13 with all loads on
the alternator is not keeping up with the load.
I would start by replacing the alternator
if the idle problem continues you may need to check the Idle Air Control Motor
thank you for using Just Answer