Tech-
nical
Service
inspec-
tion
Monthly Weekly
ELECTRICAL SYSTEM
Spark plug. Inspect spark plugs for dirty or cracked insulators.
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Clean dirt and oil from spark-plug insulators.
Remove and clean the plugs and adjust the point gaps (par. 117d). See that plugs and
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gaskets are in good condition before they are replaced.
Battery. Inspect for a cracked or leaky case, for loose holddown clamps, and for dirt
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and corrosion on top of the battery. Check for loose, corroded, and damaged
terminals and cables. Check level of the electrolyte; proper level is approximately
one-half of an inch above the plates. Check the specific gravity and record reading
on DA Form 464. A reading from 1.275 to 1.300 indicates a fully charged battery.
Readings of 1.225 or below indicate the battery should be recharged or replaced.
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Clean all dirt and corrosion off the top of the battery, posts, cables, and terminals.
Replace damaged cables. Apply a thin film of chassis grease over the terminals.
Add distilled water if needed to bring the solution up to proper level. If freezing
temperatures prevail, the battery must be charged for a period long enough to mix
the solution thoroughly. See that the battery is securely mounted, that filler caps are
tight, and that vent holes are open.
Generator and starter. Inspect the generator and starting motor for loose mounting
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bolts and wire connections.
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Inspect commutators and brushes for excessive wear, dirt, and oil deposits. gee that
brushes are free in their holders and that brush wires are secure.
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Tighten any loose mounting bolts and wire connections. Replace or free-up brushes
and clean commutators if necessary (par. 112d).
Magneto. Inspect the points and rotor for cracks, burned contacts, a faulty impulse
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coupling, or corroded terminals. The correct breaker point gap is 0.015 inch at full
separation.
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Clean or replace the end cap assembly if necessary. Adjust the breaker points if
necessary (par. 116a).
Wiring and switches. Inspect the wiring for oil-soaked, cracked, or frayed insulation,
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broken wires, and loose or corroded connections.
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Replace defective switches and wires. See that all connections are clean and tight.
Voltage regulator. Check the voltage regulator for proper operation and secure
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mounting. See that wire connections are tight. The regulator should allow an
appreciable charge to go into the battery after the starter is used. After the battery is
fully charged, the ammeter should read zero or show only a slight charge.
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