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.
1998 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE
On-Vehicle Testing
- Turn ignition switch to RUN position. Check charge indicator light. If indicator light illuminates, go to next step. If indicator light does not illuminate, turn engine off and go to step 5).
- Start engine and let idle. Check charge indicator light. If indicator light does not illuminate or blink, go to next step. If indicator light is still illuminated or blinks, check fan belt tension, check "S" and "B" terminals for proper contact and check generator output. See GENERATOR OUTPUT SPECIFICATIONS table.
- Check voltage at battery terminals. If voltage is 12.5-15.5 volts, go to next step. If voltage is greater than 15.5 volts, replace regulator assembly. If voltage is less than 12.5 volts, check IC voltage regulator. If regulator is okay, replace generator assembly as necessary.
- Turn headlights on. Check charge indicator bulb. If indicator light illuminates or blinks, check diode assembly. See DIODE ASSEMBLY under BENCH TESTING. If indicator light does not illuminate or blink, system is functioning properly at this time.
- Disconnect generator harness connector. Ground terminal "L" (Brown wire) at generator harness connector. Turn ignition switch to RUN position, engine off. Check charge indicator light. If indicator light does not illuminate, repair indicator light circuit and/or replace bulb. If indicator light illuminates, check IC voltage regulator and positive terminal of diode. See DIODE ASSEMBLY under BENCH TESTING.
GENERATOR OUTPUT SPECIFICATIONS (1)
| Engine RPM | Amps | |||||
|---|---|---|---|---|---|---|
| Forester | (2) | |||||
| Impreza | ||||||
| 1500 | 30 Or Greater | |||||
| 2500 | 64 Or Greater | |||||
| 5000 | 76 Or Greater | |||||
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Factory Service Tools
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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.