alopeks
NAXJA Forum User
- Location
- D/FW Metromess
Have a low voltage (12-ish max) problem, but cannon can't seem to find the source.
99 XJ
4.0
AW4
233,686 miles (~12K on the reman engine)
Basically stock, with a baby lift and 31s. And it's my daily/only.
Last week on the way home the voltage dropped to 12 or so for a couple minutes, then to basically nothing. Couldn't really tell if it was reading 9 or just pegged as low as the gauge went. I got a "check gauges" light as soon as that happened. Limped it to an O'Reilly's a few blocks away, hoping it was a battery and nothing more serious. Battery checked out fine, alternator checked out fine, voltage regulator failed the test. Learned that the voltage regulator is part of the PCM. Thought some unkind thoughts about the Chrysler Corporation for a few min.
Had to get towed home after not getting much farther down the road. I spent last weekend checking every ground, cable, and connection I could find, hoping it was not the PCM. I charged the battery, started it up, and while it never fell to 9, the thing still never made it past 12.16 volts while running. Nothing changed, even with replacing all the battery cables (Big 7 Upgrade, which I had already but hadn't installed yet), so I ordered a pre flashed reman PCM. It came yesterday, I installed it this morning, Jeep started right up, and nothing has changed. Still only reading 12.16V while running.
Chance there's just the same problem with the reman PCM, but surely it's not THAT likely... Right?
Could a faulty alternator pass just enough to fool the tester? Because I'm tired of this, and tired of Dallas Area Rapid Transit. DART isn't known for being the most reliable system around, but it's the only way I have to get to work without my Jeep, and I'm "essential" apparently...
TIA!
-alopeks
99 XJ
4.0
AW4
233,686 miles (~12K on the reman engine)
Basically stock, with a baby lift and 31s. And it's my daily/only.
Last week on the way home the voltage dropped to 12 or so for a couple minutes, then to basically nothing. Couldn't really tell if it was reading 9 or just pegged as low as the gauge went. I got a "check gauges" light as soon as that happened. Limped it to an O'Reilly's a few blocks away, hoping it was a battery and nothing more serious. Battery checked out fine, alternator checked out fine, voltage regulator failed the test. Learned that the voltage regulator is part of the PCM. Thought some unkind thoughts about the Chrysler Corporation for a few min.
Had to get towed home after not getting much farther down the road. I spent last weekend checking every ground, cable, and connection I could find, hoping it was not the PCM. I charged the battery, started it up, and while it never fell to 9, the thing still never made it past 12.16 volts while running. Nothing changed, even with replacing all the battery cables (Big 7 Upgrade, which I had already but hadn't installed yet), so I ordered a pre flashed reman PCM. It came yesterday, I installed it this morning, Jeep started right up, and nothing has changed. Still only reading 12.16V while running.
Chance there's just the same problem with the reman PCM, but surely it's not THAT likely... Right?
Could a faulty alternator pass just enough to fool the tester? Because I'm tired of this, and tired of Dallas Area Rapid Transit. DART isn't known for being the most reliable system around, but it's the only way I have to get to work without my Jeep, and I'm "essential" apparently...
TIA!
-alopeks