New to the forum, and looking for some insight / help on a problem I'm having. My daughter tells me the battery light is coming on periodically on her PT Cruiser, but not consistantly. Sometimes at idle, sometimes driving, lights on lights off, etc. At idle I check the voltage at the battery and show about 15.9 VDC, plus I notice moisture on the battery top, so likely gassing due to overcharge. I put my scanner on the car, and in live mode, it shows about 14.5 VDC, which is pretty much dead on spec, while my DVM still reads about 15.9 VDC. I pul all the grounds, clean them off, voltage is now about 15.6 VDC, but not enough to matter. I've ohmed out the battery cable to the alternator, with about 0-2 ohms of resistance. So I'm left with 2 things I can think of. 1. I have high resistance on the sensing lead from the alternator to the PCM or 2. A bad alternator. Any thoughts or guidance on typical issues, or am I missing soemthing else here that could be the problem? Thanks in advance.