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LIGHTING SYSTEM-DIAGNOSIS
8-63
Cleaning und Regapping
Carefully clean the spark plugs in an abrasive type
cleaner. Use a pin type feeler gauge to check spark
plug gap. Reset gaps to
.035
inch.
NOTE:
Before setting spark plug gap, file center
electrode flat, make adjustment by bending ground
(side) electrode, never bend the center electrode.
Inspect the spark plug cables, coil secondary (high
tension) cable, nipples and covers for cracks, wear
and fraying. Always use the neoprene insulating nip-
ples whenever it becomes necessary to replace high
tension cables or nipples. Inspect for loose terminals.
When installing spark plugs, tighten to 30 foot-
pounds.
PART 5
LIGHTING SYSTEM
H EA DLAMPS
SERVICE DIAGNOSIS
Condition
Possible Cause
Correction
HEADLAMPS DIM (en-
(a) Partly discharged battery.
(a) Charge battery.
gine idling or shut
off)
(b)
Replace battery.
(c) Test headlamp circuit including ground con-
(d) Replace sealed beam units.
(b) Faulty cells in battery.
(c) High resistance in headlamp circuit.
(d) Faulty sealed beam units.
nection. Make necessary repairs.
HEADLAMPS DIM (en-
gine running above idle)
(a) High resistance in headlamp circuit.
(b) Faulty sealed beam units.
(c) Faulty voltage regulator.
(a) Test headlamp circuit including ground con-
(b) Replace sealed beam units.
(E) Test voltage regulator and alternator. Make
nection. Make necessary repairs.
necessary repairs.
LAMPS FLICKER
(a) Loose connections or damaged wires in headlamp (a) Tighten connections and inspect for damaged
(b) Headlamp wiring insulation damaged producing
(b) Test headlamp wiring and replace or tape
circuit.
wiring.
momentary.
damaged wires.
LAMPS
BURN
OUT FREQUENTLY
(a) High voltage regulator setting.
(b) Loose connections in headlamp circuit.
(a) Adjust voltage regulator.
(b) Inspect circuit for loose connections.
LAMPS WILL NOT
(a) Discharged battery.
LIGHT
(b) Loose connections in headlamp circuit.
(b) Tighten connections.
(c) Burned out lamps.
(d) Open or corroded contacts in headlamp switch.
(e) Open or corroded contact in dimmer switch.
(a) Recharge battery and correct cause.
(E)
Replace bulbs or sealed beam unit.
(d) Replace headlamp switch.
(e) Replace dimmer switch.
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