Join Date: Mar 2006
Location: San Angelo, Texas
[QUOTE=cutlass1972]I was driving down the road yesterday and out of the blue my jeep beeps (just like when the gas light comes on), my voltage gauge pegs (passed the 19v mark), the check gauges light comes on (strange rapidly oscillating / pulsating light not quite solidly lit), and the check engine light turns off (had been on, more on that later).
Mine did/does the same thing. I've got the same jeep as you, to include color and top. I'm also getting a "charging system overload" OBDII code from the shop handheld OBD computer. I've never had a code pop up in the odo area.
I've chased all the grounds, to no avail. The voltage regulator (VR) is not in the alternator. It is part of the PCM. One thing that everyone seems to agree on is that everyone has a different idea on how to resolve this.
I find that when I'm driving about and the Volt Meter (VM) pegs, if I stop and let the engine idle, the VM will return to the 14 mark. I used 3 different mediums to monitor my charging system: A hand held volt meter, a roll about Snap on shop charger/load tester, and the handheld OBDII hand held computer. the following voltages were recorded: HHVM: 13.6V. Snap On: 12.6V. OBDII: 13.6 to 15.3V. This happened in the shop, with me revving the engine. I'm going with the OBDII because that's what the computer thinks is happening, and the Snap On because that's what's reall being passed. I later took the jeep out on the highway with the OBDII attached, and as the VM pegged to 19v, the OBDII remained at 13.6 to 15.3 Volts.
What does this mean? I think the PCM is hosed, in some manner. I just run around with the headlights on (when I remember to), providing more load to the system, and this keeps the VM from pinging. If your system is pinging at 19V (according to the VM), it's charging the battery too much, which could lead to your battery exploding. I know that my VM is incorrect when it shoots to 19v, so I'm not worried about the battery exploding.
Were I you, I'd have my charging system checked, if at all possible, when the needle is pegged.
Keep me informed of any luck you have with resolving this situation. The numbers for the PCM are on the front of the PCM, underneath the three plugs. I think there's a bar code there also.