No charging happening.
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JK Newbie
Joined: Aug 2025
Posts: 6
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No charging happening.
Hey guys, I know this has been beat like a dead horse because it’s a JK with electrical problems but I’m hoping maybe someone has a different idea because I’m all out. 😅
Started with a dead battery, replaced the battery, dead again, replaced the alternator, dead again, replaced the battery and the alternator with known good ones, dead again, replaced the PCM thanks to the guys at WranglerFix, alternator is showing good, but doesn’t *seem* to be charging the battery (I haven’t driven it since I put the pcm in, but battery isn’t kicking up in voltage when it’s running). I checked all of the grounds, they’re solid but I cleaned them anyways and added some dielectric grease where there were more than 2 connectors on a post. Put it on a trickle charger last night. Battery charged to full according to the trickle charger. Take the charger off, battery showing 12.78 volts. Voltage drop is .08. I tested from engine ground to TIPM input, and the voltage was the same as the battery (12.2), not the same as the alternator (13.8).
Any ideas on where to run next? Do I trace wiring and try to find an issue in that?
I appreciate y’all immensely!
Started with a dead battery, replaced the battery, dead again, replaced the alternator, dead again, replaced the battery and the alternator with known good ones, dead again, replaced the PCM thanks to the guys at WranglerFix, alternator is showing good, but doesn’t *seem* to be charging the battery (I haven’t driven it since I put the pcm in, but battery isn’t kicking up in voltage when it’s running). I checked all of the grounds, they’re solid but I cleaned them anyways and added some dielectric grease where there were more than 2 connectors on a post. Put it on a trickle charger last night. Battery charged to full according to the trickle charger. Take the charger off, battery showing 12.78 volts. Voltage drop is .08. I tested from engine ground to TIPM input, and the voltage was the same as the battery (12.2), not the same as the alternator (13.8).
Any ideas on where to run next? Do I trace wiring and try to find an issue in that?
I appreciate y’all immensely!
