Generac Power Systems IM Series - Manual (Page 16)

tactor and to the cable terminal on Starter Motor. Engine
should crank.
Test Results:
A. Engine cranks normally but does not crank when using
the Start/Stop Switch: Go to Step 5.
B. Engine does NOT crank: Replace Starter Motor SM
C. Engine cranks normally with jumper cable and with
Start/Stop Switch: STOP tests.
NOTE: For Starter Motor SM testing and repair In-
Structlons, refer to ENGINE SERVICE MANUAL.
Step 5- Check Start/Stop Switch SW1
Test Procedure:- See Figure 3. Test the Start/Stop
Switch as follows:
1, Set a Volt-Ohm-Milliammeter (VOM) to its "Rxl" scale
and zero the meter. Connect one VOM test lead to the
Wire 0 terminal of Start/Stop Switch; connect second
meter test lead to a clean frame ground. The VOM should
indicate continuity.
Test Results:
A. VOM does NOT indicate continuity: Repair or replace
Wire 0 between Switch and frame ground connection, as
necessary.
B. VOM indicates continuity: Continue test.
2. Connect a jumper wire between the Start/Stop Switch
Wire 17 terminal and a clean frame ground connection.
Engine should crank and start. Disconnect jumper wire to
terminate cranking when engine starts. To stop the en­
gine, connect jumper wire to Wire 18 terminal of
Start/Stop Switch and to frame ground.
Test Results:
A. Engine cranks, starts and shuts down normally when
using jumper wire, but not when using Start/Stop Switch:
Replace Start/Stop Switch.
B. Engine will not crank when using jumper wire: Go to
Step 6.
C. Engine cranks and stops normally when using jumper
wire and with Start/Stop Switch: STOP tests.
Step 6- Check Control Relay CR1
NOTE: See WIRING DIAGRAM & ELECTRICAL
SCHEMATIC on Page 11. Two different types of Con­
trol Relay CR1 are used on the NP series generators,
Identified In the Wiring Diagram as "CRI" and "Al-
ternateCRl". Also see Figures 4 and 5
Test Procedure:- See Figure 4 or 5. Test the Relay as fol­
lows:
1. Connect the positive (+) test lead of a d-c voltmeter to
CRI terminal 12 (Wire 15 terminal): connect the negative
(-) test lead to a clean frame ground. Meter should indi­
cate battery voltage. If alternate CRI is installed, connect
meter positive (+) test lead to Relay terminal 9 (Wire 15
terminal).
Test Results:
A. Battery voltage is indicated; Continue test
B. Battery voltage is NOT indicated:- Repeat Step 1. Also
check Wire 15 between Relay CRI and Fuse FI for open
or disconnected condition; Wire 13 between Fuse FI and
Starter Contactor SC for open; and positive (+) battery
cable to Starter Contactor SC.
2. Connect the positive (+) test lead of a d-c voltmeter to
CRI terminal 2 (Wire 56 terminal); negative (-) test lead
to frame ground. If alternate CRI is installed, connect
meter positive (+) test lead to Relay terminal 3 (Wire 56
terminal). Battery voltage should be indicated.
Test Results:
A. Battery voltage NOT indicated: Replace Control Relay
CRI
B. Battery voltage was indicated: Repeat Steps 1 through
5. Refer to WIRING DIAGRAM (Page 11) and test wires
for open or shorted condition.
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