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 MANUALSJAGUAR1991XJ-6 L6-4.0LREPAIR AND DIAGNOSISSTARTING AND CHARGINGCHARGING SYSTEMTESTING AND INSPECTIONTEST 4-ALTERNATOR OUTPUT
1991 Jaguar XJ-6 L6-4.0L
Test 4-Alternator Output
1991 Jaguar XJ-6 L6-4.0LSECTION Test 4-Alternator Output
Fig. 2 Output Test:
1. Disconnect +D lead from alternator. Fig. 2.
2. Connect a ammeter between disconnected lead and alternator +D terminal.
3. Switch on all loads (except wipers) for one minute to discharge battery.
4. Run engine at normal charging speed. Ammeter will indicate maximum alternator output. Refer to alternator specifications.
5. If low output is obtained, proceed with tests. If no output is obtained, remove and bench check alternator.
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.