Repair Manual Mobile Generator - Wacker Neuson

G 70 Troubleshooting Engine Start System
7.4 Checking the Starter Relay
Prerequisites Battery voltage measuring 11–13 VDC
Procedure Follow the procedure below to check the starter relay.
1. Locate the starter relay.
2. Check the voltage between the red wire #50 and ground.
Is at least 9.8 VDC measured?
Yes ____ No ____ Your reading
Continue. Repair or replace red wire #50.
3. Place the START/RUN switch in the ON position.
4. Measure the voltage between red wire #422 and ground during cranking.
Is at least 9.8VDC measured?
Yes ____ No ____ Your reading
Continue. Repair or replace red wire #422.
5. Check the connection to ground of both black wires.
Is there a path to ground?
Yes ____ No ____ Your reading
Continue. Repair or replace both black wires.
6. Place the START/RUN switch in the ON position.
7. Measure the voltage between the red wire (R) running to the starter solenoid
and ground.
Is at least 9.8 VDC measured?
Yes ____ No ____ Your reading
The starter relay is OK. The starter relay has failed;
replace it.
The starter relay has now been checked. Continue with Section 7.5 Checking the
Starter Solenoid.
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