Case 580SR Service Manual page 965

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RESISTANCE OF THE STARTER MOTOR
CIRCUIT
(Voltage lowering)
If the current draw is excessive, check the circuit by
noting down the voltage lowers at various compo-
nents of the circuit.
IMPORTANT: disconnect the injection pump fuel in-
let cut-off wire from the solenoid.
Positive cable of the battery:
1. Connect the positive cable of the voltmeter (1) to
the positive terminal of the battery (2).
2. Connect the negative cable of the voltmeter (1)
to the battery terminal of the starter motor sole-
noid valve (3).
3. Start the starter motor and observe the reading
on the voltmeter. If the voltage drop exceeds
0.2 V, check and retighten the cable connec-
tions. Check the voltage again. If it is still exces-
sive, replace the cable.
Starter motor connections to ground
1. Connect the positive cable of the voltmeter (1) to
the body of the starter motor (2).
2. Connect the negative cable of the voltmeter (1)
to the motor block (3).
3. Start the starter motor and observe the reading
on the voltmeter. If the voltage drop exceeds
0.2 V, check and retighten the cable connec-
tions, check the ground connections between
the starter motor clamp and the undercarriage.
Ground cable of the battery:
1. Connect the positive cable of the voltmeter (1) to
the motor block (2).
2. Connect the negative cable of the voltmeter (1)
to the negative terminal of the battery (3).
3. Start the starter motor and observe the reading
on the voltmeter. If the voltage drop exceeds
0.2 V, check and retighten the ground cable con-
nections. Check the voltage again. If it is still ex-
cessive, replace the ground cable.
SECTION 55 - ELECTRICAL SYSTEM
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