SOURCE: 1979 Ford Thunderbird alternator not charging
Are the connections really dirty at the voltage regulator? These tend to get corrosion on them and cause weird charging system issues. Also make sure the ground is good on the regulator.
SOURCE: Both fuel pump relays run
You could have a bad fuel pump relay switch. The fuel pump
relay switch gets the fuel pump running in the vehicle during the start
cycle. The terms fuel pump relay and fuel pump relay switch are used
interchangeably. The fuel pump relay begins its job when the automobile
operator turns to the ignition on, but before the motor is actually
running. At that point, the fuel pump relay in some cars sends a signal
to the ignition switch, which in turn sends a signal to the fuel pump
to turn on. Others fuel pump relays have actual circuitry inside of
them that receive the ignition signal and directly signal the fuel pump
to engage.
Have a great day!
SOURCE: My father has a 1984 F150 Overdrive. It will run
Crank sensor - 100%
Usually near the crank pulley or behind it, fails when hot, then restarts when cooled down.
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