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IV. ENGINE
61
I
4. Checking armature coil far continuity
A shorted or grounded armature would affect the proper
operation of the starting motor. The armature is tested
electrica1ly far ground by placing one test probe on the
laminated care and the other on the commutator bars. If
there is continuity, the armature is grounded.
Fig. 4-129
Checking armature coil
Starting magnetic switch
1. Check the field coil for continuity.
If there is no continuity, the field coil has an open-circuit.
The field coil is norma! if it clicks into position when a l2V
battery is connected with the switch turned OD.
Fig. 4-130
(1) Starting magnetic switch
2. Check the operation of the magnetic switch.
Time may sometimes render it useless due to badly pitted
or burnt switch contacts. The switch is tested electrical1y
far function by connecting a 12V battery to the field coil
with the switch turned on.
If there is no continuity, it is a signal that the switch is not
in a good condition.
t'1g. 4-1-'1
~l) ~tartmg magnenc swltcn
Starting clutch
l. Check the rollers, roller caps and clutch outer on the
generator rotar far wear or damage and, if necessary,
replace.
2. Check the rollers and springs far smooth operation.
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