My 1998 Dodge Grand Caravan Sport with the 3.3 has an electrical issue. It starts and idles fine, but when when the RPM gets above 2300 the battery light comes on and the LCD dash displays go out. I put a voltage meter on the battery, and it shows 13.8-14.2 volts at idle, but when you rev it the voltage jumps as high as 18 volts! The internet says the voltage regulator is in the PCM. Is my only alternative to replace the PCM or could there be another cause? Could it just be a bad alternator. Is there another test I should perform? Any advice is appreciated!