Section 03 TROUBLESHOOTING
Subsection 05 (ELECTRICAL SYSTEM)
MMR2000_116_03_05A.FM 03-05-1
ELECTRICAL SYSTEM 0
The following chart is provided to help in diagnosing the probable source of troubles. It should be used
as a guideline.
SYMPTOM HEADLAMP NOT LIGHTING.
CONDITION WHITE BULB.
Test/Inspection 1. Check bulb.
a. Burnt bulb.
Replace bulb.
CONDITION BROKEN ELEMENT.
Test/Inspection 1. Check for loose headlamp housing and bulb socket.
a. Vibration problem.
Tighten headlamp mounting screws. Lock bulb in socket. Replace bulb.
CONDITION MELTED FILAMENT (ENDS OF ELEMENT HOLDER) AND BLACK BULB.
Test/Inspection 1. Check voltage at headlamp at different speeds. It must not be above 15 Vac.
a. Excessive voltage in lighting circuit.
Ensure proper wire connections and grounding. Retest.
SYMPTOM HEADLAMP DIMING.
CONDITION NORMAL USE.
Test/Inspection 1. Check voltage at headlamp at different speeds. It must not be below 11 Vac.
a. Insufficient voltage in lighting circuit.
Replace voltage regulator and retest.
b. Wires are worn or loose.
Ensure proper wire connections and grounding. Retest.
2. Visually inspect wiring harness for damaged and/or melted wires and/or bad
wire terminal crimping and/or connections.
a. Heating, rotating or sharp part in contact with harness. Improper harness routing.
Repair/replace damaged wires and/or terminals. Reroute harness where necessary.
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