Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2004EXPLORER 2WD V6-4.0L VIN EREPAIR AND DIAGNOSISSTARTING AND CHARGINGCHARGING SYSTEMTESTING AND INSPECTIONPINPOINT TESTSTEST C
2004 Ford Explorer 2WD V6-4.0L VIN E
Test C
2004 Ford Explorer 2WD V6-4.0L VIN ESECTION Test C
PINPOINT TEST C: THE CHARGING SYSTEM OVERCHARGES (BATTERY VOLTAGE IS GREATER THAN 15.5 VOLTS)
Normal Operation
The generator output is determined by the voltage of the A circuit 35 (OG/LB). The A circuit voltage is compared to a set voltage internal to the regulator and the regulator controls the generator field current to maintain the correct generator output. The set voltage will vary with temperature and is typically higher in cold temperatures and lower in warm temperatures.
Possible Causes
- A circuit 35 (OG/LB) high resistance
- battery ground connections
- generator
Test C1-C2:
Normal Operation
The generator output is determined by the voltage of the A circuit 35 (OG/LB). The A circuit voltage is compared to a set voltage internal to the regulator and the regulator controls the generator field current to maintain the correct generator output. The set voltage will vary with temperature and is typically higher in cold temperatures and lower in warm temperatures.
Possible Causes
- A circuit 35 (OG/LB) high resistance
- battery ground connections
- generator
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.