I have a 1992 Ford F150 inline 6. The truck was running great when I stopped at a friend’s house for a few minuets. When I went to leave the truck would not start, all I got was a click from the solenoid when I turned the key. After replacing the solenoid and the starter, the truck would start and stay running. But now the amp light is on and the truck is running off the battery power, the battery is not being charged by the alternator. Below are the things I have tried:

- Replaced starter. Old one tested bad at advance auto parts. Truck will start.
- Replace solenoid with one that was in the glove box of the truck when I bought it.
- Replaced the alternator. Original tested bad at AutoZone.
- Put original solenoid back in.
- Replaced battery terminal connections.
- Replaced battery with a DieHard from Sears. Original battery (tested bad at Sears) was 10 years old and undersized for the truck.
- Had new alternator tested again at AutoZone. Tested Good. The store gave me a new alternator that also tested good.
- Took truck in to AutoZone to have them run a diagnostic on it. Test showed that the voltage regulator was bad. Took alternator back inside it tested good.
- Belts look good.
- Inspected all wires for breaks and corrosion. All look good from what I could see.

I am all out of ideas and at my wits end. Any and all help is greatly appreciated.