Inspection And Repair - Volvo Penta D65A MS Workshop Manual

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Inspection and Repair

Magnetic Switch
Testing the magnetic switch coil
1. Test the pressure coil and holding coil for an
open ciruit. The coils are open-circuited if there is
no continuity between the M terminal of the mag-
netic switch and the case.
Resistance: 1.4 ohms (approx.)
2. Apply voltage of 24 volts between the M terminal
of the magnetic switch and the case. Now push in
the plunger by hand. When you release your
hand, the plunger should not be attracted.
Testing magnetic switch contact points
Measure the load current flowing through the starter.
If the voltage drop between terminals B and M ex-
ceeds 0.3 volts per 100 amperes, clean or replace
the contact points.
If the starter switch is tumed to OFF during voltage
measurement, the battery voltage is directly applied
to the voltmeter. This can damage the voltmeter. Al-
ways turn the starter switch to ON before measuring
the voltage, then turn it OFF after measuring the volt-
age.
IMPORTANT! Do not apply 24 V on terminals to
test the magnetic switch movement.
Group 30 Electrical System
203