Volt Gauge
 

Hey guys.

So heres the problem that im having. When i start the truck the gauge sweeps up to the 14v mark, then drops down to 0 and turns on the check gauge light. ive checked the alternator and it is charging/everything works. Any ideas on what could be the dilema, i cant seem to find a good diagram for where the gauge is getting its reading from, or in this case, the ecm.