Generac Power Systems NP-40G - Manual (Page 110)

Section 7,2- ENGINE DC CONTROL SYSTEM
Test 8- Check Power Supply to
Starter Motor (Continued)
RESULTS:
1. If power supply is good and engine cranks, stop
tests.
2. if power supply Is good but engine does NOT
crank, replace the Starter.
3. If power supply Is bad, go on to Test 9.
Test 9- Check Wire 56 Power to
Starter Contactor
DISCUSSION:
When the Start-Run-Stop switch is set to
"START", the Engine Controlier circuit board must
react by delivering battery voltage to the Starter
Contactor coil, via Wire 56. Without this battery
voitage, the Contactor wiii not energize and battery
output wiii not be deiivered to the Starter Motor.
The engine wiii not crank.
TEST PROCEDURE:
1. Set a VOM to read battery voitage (12 VDC).
2. Connect the meter test leads across the Wire 56
starter contactor terminal and frame ground.
3. Set the Start-Run-Stop switch to "START". The
meter should indicate battery voitage.
RESULTS:
1. No power to Wire 56 terminal, go to Test 10.
2. If power to Starter Contactor is good, go to Test
11 .
Test 10- Check Engine Controlier
Board Power Supply
DISCUSSION:
Fused battery voltage is delivered to the Engine
Controller circuit board via Wire 15. If this power
(12 VDC) Is not available to the board, cranking and
startup will not be possible.
This test will determine if battery voitage is avaii-
abie to the circuit board for its operation.
TEST PROCEDURE:
Set a VOM to read battery voitage (12 VDC).
Connect one VOM test iead to the Wire 15 terminal
on the Engine Controller circuit board. Connect the
other test lead to frame ground. The meter should
indicate battery voltage.
RESULTS:
1. If battery voltage is NOT indicated, check Wire
15 between the 15 amp fuse and the Engine Con-
troiier board. Repair, reconnect or replace the wire
as needed.
2. If 12 VDC was indicated, go to Test 12.
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