So when I merged on the highway i reved it kinda high and my alt light came on and stayed on. I tryed turning off my truck and start it back up and nothing. Not sure what to do next. I was able to drive home about 10miles with no problems.

1973 f350 300 inline 6


Thanks for any help.

 

Check voltage at the battery when the truck is running with an ammeter, should be around 14.6 if its lower you have a charing system problem. Most likely bad regulator or alternator.

 

Use a voltmeter, not an ammeter. A voltmeter measures voltage; an ammeter measures current.

 

ok ill check it tomorrow and let you guys know what i find out

 

With a Ford 1G alternator, expect around 13.2-13.6 volts at idle, 2000 RPM should crank out 13.8+ with headlights and heater ON.

Like FMC said, use a mulitmeter set to DC VOLTS, not amps.

Josh