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Message: [QUOTE="Snake, post: 367073, member: 97"] And it did, but not quite the way I expected. LOL I had planned on going through everything again, item by item, and retesting ater each change. For example, cleaning one ground and then seeing if the alternator was charging. If it was, then I found my culprit. I knew that my batteries were getting weak through all the troubleshooting, so I put them on a charger Tuesday morning. Prior to charging them, I was reading alternator output in the high 11v / low 12v range and the batteries were showing 12.1v when disconnected. Tuesday evening, after the charge was complete, I started the truck to turn it around in the driveway (put the front end in the shade)..........and I saw 13.1v on the ScanGuage. Not believing what I was seeing, I checked output at the alternator and read 13.3v at idle. This is with an OEM alternator that tested good on the bench that wasn't charging the batteries the day prior. I don't believe things magically fix themselves, so I sat on it and drove the truck to my in-law's house yesterday morning to go fishing. ScanGuage was showing 12.8 - 13.3v the entire time (lights on and A/C running) and read the same on the return trip home that afternoon. I was encouraged by what I was seeing, but still went back and double checked all the fusible links, voltage at the alternator connection, all the related wiring, and pulled and cleaned the grounds. Threw the DC Power 300 SPX on, fired the truck up, and read 13.7v instantly (both on the ScanGuage and on the multimeter). Glow plugs finished cycling and I saw 13.9 - 14.1v (mostly 14.0 - 14.1). Curious, I began turning on every electrical component within arms reach: 6" PIAA lights, A/C full blast, high beams with a 20" Rigid LED bar, stereo, seat heater, interior lights, air compressor, and aux coolant pump. The readings never dropped below 13.8, and that was a momentary dip. While watching the multimeter, I started pushing and pulling on connectors, wires, and the other stuff I'd been over in previous efforts and saw no change in the numbers. So it's resolved, but I don't know if I'd say it's fixed. I'm still not sure what happened or what was wrong, and the only thing I did was charge the batteries. :wtf: [/QUOTE]