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I had the check gauges lamp come on and noticed low volts the other morning, it climbed back up after a few seconds and the check gauges lamp went off but the voltage was only at about 11-12v range on the gauge (usually 13-14). I took the alternator to autozone, bench tested showed bad, got a replacement and bench tested before leaving, that one tested good. Also tested batteries, both good. I installed everything and still nothing for charge voltage though. After reading some other sites about the PCM voltage regulator going bad, I got an external voltage regulator and was about to connect it up today, but I read a post here a couple of days ago and it got me thinking about the connector/cable and testing that first. I pulled the little 2 wire connector from the alternator, started the truck and tested from the alt plug using a test lamp between the blue wire and neg- post and get light, but when I tested between the green wire and pos+ post I only get a dim light. The next thing it says to check if everything is good is the cables from the alt to the PCM but I don't know if the dim light for the green wire is good or bad... I'm about to check that out now, just wondering, do you have to remove the neg battery posts before removing the PCM connectors for that resistance check on those cables, or just keep the key turned off and pull the connectors off with the batteries connected?