If the battery checks out okay, you can replace just the voltage regulator inside the alternator.
The system shouldn't exceed 15 volts. If the battery tests out okay and you are mechanically inclined, you can replace just the voltage regulator inside the original 1984 alternator. A replacement regulator should cost aprox $30.
your alternator is going bad
Alternator may not be charging battery sufficiently- check with a voltmeter A fully charged battery should read approx. 12.8 volts without engine running With engine running should read approx. 13.8-14.2 volts
12 volts shut off. Running it should read around 13.5-16 volts at the battery posts. Any less and the alternator is bad.
The choke light came on in my 1984 Celebrity when the alternator belt broke thus not charging the battery. Replacing the belt caused the choke light to go out. Since then I have noticed that whenever the alternator is not putting out enough voltage the choke light comes on.
what does sta mean on a 1984 ford f150 alternator
Inside the alternator.
The proper way to check the alternator is to use a voltmeter with everything hooked up. Unhooking the battery with the engine running can cause a voltage spike that will damage any electronics on the vehicle. If the truck isn't charging, test the voltage regulator on the firewall.
old myth, bad for alternator, dont do this..
On the 250 cid engine the alternator lives on the passenger side front of the engine.
Inside the rear of the alternator It is on the firewall.
you could also check the ground on the starter sometimes they will get really greasy and hence no ground-no charge or try the voltage regulator or the solenoid