Section 7.2

ENGINE DC CONTROL SYSTEM / AC TROUBLESHOOTING

TEST 1- CHECK 7.5 AMP FUSE

DISCUSSION:

The panel-mounted 7.5 amp fuse is connected in series with the 12 VDC power supply to the engine DC control system. A blown fuse will prevent engine priming, cranking and running.

TEST PROCEDURE:

Push in on fuse holder cap and turn it counterclock- wise to remove cap and fuse. Check the fuse visually. If the fuse metal element has melted open, replace the fuse.

If the visual check is uncertain, use a VOM to check fuse.

RESULTS:

1. If fuse is good

Figure 2. Primer Switch

TEST 3- CHECK POWER TO FUEL PUMP

DISCUSSION:

a. And if priming function does not work, go to Test 2.

b. And if engine will not crank, go to Step 4. 2. If fuse is bad, replace it.

When the rocker type primer switch is held at ON", position, fused battery voltage is delivered to the elec- tric fuel pump. The pump should then turn on and prime the carburetor.

During cranking and startup, the A6060 circuit board will deliver battery voltage to the Wire 14 circuit and to the Fuel Pump. The pump should turn on and run.

Figure 1. 7.5 Amp Fuse

TEST 2- CHECK POWER TO PRIMER SWITCH

DISCUSSION:

This is a check of the PRIMER SWITCH on the panel. When the switch is actuated to its "PRIME" position, fused battery voltage is delivered directly to the elec- tric fuel pump on units with gasoline fuel system. On units with gaseous fuel system, battery voltage is delivered to the fuel lockoff solenoid.

TEST PROCEDURE:

Set a VOM to read battery voltage (12 VDC). Connect the meter test leads across the Wire 15 terminal of the Primer Switch and frame ground. The meter should read battery voltage.

RESULTS:

1.If battery voltage is indicated, go to Test 3.

2.If battery voltage is NOT indicated, go to Test 4.

Figure 3. Fuel Pump

TEST PROCEDURE:

Locate the red Wire 14A that connects to the fuel pump. A wiring connector connects the wires near the pump. Separate the wire, then check for DC power as follows:

1.Set VOM to read battery voltage.

2.Connect the VOM test leads across the Wire 14A from the Primer Switch and frame ground.

3.Hold the Primer Switch at °ON" (Prime). Meter should read bat- tery voltage.

4.Hold the panel Start-Run-Stop switch at "START". The meter should read battery voltage.

Page 7.2-10

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Generac Power Systems 940-2, 941-2 Test 1- Check 7.5 AMP Fuse, Test 3- Check Power to Fuel Pump, Discussion, Results
Page 119 Page 121

941-2, 940-2 specifications

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