Hi,
How many volts is it showing? The voltage regulator is the only thing that controls voltage. Is it over 15v?
As far as testing, here are directions for checking for an overcharging system. Take a look through it and let me know if it helps. The two attached pics are actually the test procedures.
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2002 Ford Truck F 150 4WD Pickup V8-5.4L SOHC VIN L
Test C: System Overcharges (Voltage Greater Than 15 Volts)
Vehicle Starting and Charging Charging System Testing and Inspection Pinpoint Tests Pinpoint Tests Test C: System Overcharges (Voltage Greater Than 15 Volts)
TEST C: SYSTEM OVERCHARGES (VOLTAGE GREATER THAN 15 VOLTS)
C1
See pic 1
C1 - C2
See pic 2
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Let me know.
Joe
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Tuesday, August 11th, 2020 AT 10:31 PM