I have a '52 panel with a 350. It has a 105 amp alternator built by a reputable alternator/starter shop. When the truck is started, the alternator is charging at 14 plus volts (at the gauge and at the alternator. As the engine warms up, the gauge shows (at idle) <13 volts. As the truck is driven more (30 + minutes in city traffic), the gauge shows 9 to 10 volts at idle and 10 to 12 volts (close to 13, sometimes) at speed. I had it home and checked the battery with engine off. It was showing 12.16 volts. When running, it was 9 or 10 at the battery and at the alternator it fluctuated between 10 and 12 volts. Belt is tight. The engine has an electric fan, no stereo, just regular lights, etc. Sometimes after driving for 20 minutes, the battery won't start the truck (starts up quickly with a jump from a deep cycle battery), sometimes it will start again, no problem. Battery? Battery/starter/alternator wiring? Any suggestions to deal with this gremlin greatly appreciated.
