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 MANUALSSUBARU2007FORESTER F4-2.5L SOHCREPAIR AND DIAGNOSISSTARTING AND CHARGINGCHARGING SYSTEMDESCRIPTION AND OPERATION
2007 Subaru Forester F4-2.5L SOHC
Charging System: Description and Operation
2007 Subaru Forester F4-2.5L SOHCSECTION Description and Operation
Generator
The generator has a built-in regulator which provides diagnostic functions in addition to a voltage regulating function as follows:
1. Voltage regulation
The on-off operation of transistor connects and disconnects the field current circuit, providing a constant level of output voltage.
2. Diagnosis warning
When any of the following problems occur, the charge light illuminates.
1. No voltage generation Brush wear exceeds specified wear limits, field coil circuit is broken, etc.
2. Excessive output Output voltage is greater than 16 volts (approx.)
3. Terminal B disconnection Harness is disconnected from generator terminal B.
4. Terminal S disconnection
Harness is disconnected from generator terminal S. In this case, voltage is slightly greater than specified regulated voltage; however, voltage regulation is still controlled and the battery is prevented from becoming overcharged.
The generator has a built-in regulator which provides diagnostic functions in addition to a voltage regulating function as follows:
1. Voltage regulation
The on-off operation of transistor connects and disconnects the field current circuit, providing a constant level of output voltage.
2. Diagnosis warning
When any of the following problems occur, the charge light illuminates.
1. No voltage generation Brush wear exceeds specified wear limits, field coil circuit is broken, etc.
2. Excessive output Output voltage is greater than 16 volts (approx.)
3. Terminal B disconnection Harness is disconnected from generator terminal B.
4. Terminal S disconnection
Harness is disconnected from generator terminal S. In this case, voltage is slightly greater than specified regulated voltage; however, voltage regulation is still controlled and the battery is prevented from becoming overcharged.
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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.