Section 7

DIAGNOSTIC TESTS

Figure 7-31. – Remote Harness Connector

3.Connect one test lead to Pin Location J1-15. Connect the other test lead to a clean frame ground. “Infinity” should be measured.

RESULTS:

1.If “Continuity” is measured in Step 2, repair or replace shorted Wire 18 between J1 Connector and Start-Stop Switch.

2.If “Continuity” was measured in Step 3, repair or replace short- ed Wire 18 between J1 Connector and remote panel connector.

3.If Wire 18 checks GOOD, proceed to Problem 8 (Section 6).

TEST 31 - CHECK FUEL SOLENOID

(GASOLINE MODELS)

DISCUSSION:

If the Fuel Solenoid fails to open, the engine will not start.

PROCEDURE:

1.Remove Control Panel cover. Remove Wire 56 from the Starter Contactor Relay. This will prevent the unit from cranking during test (see Figure 7-19, Page 51).

2.Remove air filter cover. Disconnect Connector 2 which con- nects to the fuel pump.

3.Activate the Start-Stop Switch (SW1) to the START position and hold. This will activate the fuel solenoid. The fuel solenoid should energize and produce an audible click. If the fuel sole- noid does not operate, proceed to Step 4. Reconnect Connector 2 back to the fuel pump.

4.Set the VOM to measure DC voltage. Disconnect Wire 14 from the Fuel Solenoid. Connect the positive (+) meter test lead to Wire 14 that goes to the control panel.Connect the negative (-) test lead to a clean frame ground. Activate the Start-Stop Switch (SW1) to the START position and hold. Battery voltage should be measured.

5.Set the VOM to measure resistance. Disconnect Wire 0 from the Carburetor at the bullet connector. Connect one test lead to Wire 0 that goes to the control panel. Connect the other test lead to a clean frame ground. “Continuity” should be measured.

6.Connect one test lead to the Green Wire going to the carbure- tor. Connect the other test lead to the carburetor body. “Continuity” should be measured.

Short to Ground:

7.Set the VOM to measure resistance. Disconnect the bullet con- nector going to the Fuel Solenoid. Connect one meter test lead to the Red Wire going to the Fuel Solenoid. Connect the other meter test lead to the Fuel Solenoid housing. A reading of 38.0 ohms should be measured. If very low resistance is mea- sured, a short to ground exists. (Fuel Solenoid coil resistance is approximately 38.0 ohms. Current draw of the Fuel Solenoid at nominal voltage is approximately 331 milliamps or 0.331 amps).

RESULTS:

1.If the Fuel Solenoid passes Steps 4 & 5 but does NOT operate in Step 3, replace or repair Fuel Solenoid.

2.If battery voltage is not measured in Step 4, repair or replace Wire 14 between the 4-Tab Terminal Connector (TC) and the Fuel Solenoid.

3.If “Continuity” is not measured in Step 5, repair or replace Wire 0 between the Fuel Solenoid and ground terminal.

4.If “Continuity” is not measured in Step 6, repair or replace Carburetor ground wire.

5.If the Fuel Solenoid operates, proceed to Test 32.

TEST 32 - CHECK IGNITION SPARK

DISCUSSION:

A problem in the engine ignition system can cause any of the following:

•Engine will not start.

•Engine starts hard, runs rough.

A commercially available spark tester may be used to test the engine ignition system. One can also be pur- chased from Generac Power Systems (Part No. 0C5969).

PROCEDURE:

1.Disconnect a high tension lead from a spark plug.

2.Attach the high tension lead to the spark tester terminal.

3.Ground the spark tester clamp by attaching to the cylinder head (see Figure 7-32).

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Generac Power Systems 65, 55, 75 manual Test 31 Check Fuel Solenoid Gasoline Models, Test 32 Check Ignition Spark
Page 58 Page 60

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