Generac Power Systems 75, 55, 65 TEST 18 - TRY CRANKING THE ENGINE, TEST 19- TEST PRIMER SWITCH

Section 7

DIAGNOSTIC TESTS

3.In Step 7, if Wire 0 reads “Continuity”, but resistor does not measure 1 ohm, replace the Battery Charge Resistor.

4.If all of the Steps in this test pass, perform “Insulation Resistance Test” on page 13.

TEST 18 - TRY CRANKING THE ENGINE

DISCUSSION:

If the Fuel Primer Switch on the generator panel is actuated, but the Fuel Pump does not run (priming function doesn't work), perhaps battery voltage is not available.

PROCEDURE:

Hold the Start-Stop Switch at “START”. The engine should crank and start.

RESULTS:

1.If the engine cranks normally, but the priming function still doesn't work, go to Test 19.

2.If engine will not crank, go to Test 21. Refer to Problem 6 of Section 6.

3.If engine cranks but won't start, go to Problem 7 of Section 6.

4.If engine starts hard and runs rough, go to Problem 8 of Section 6.

PROCEDURE:

1.Set a VOM to read battery voltage (12 VDC).

2.Connect the positive (+) meter test lead to the Wire 15 terminal of the Primer Switch (leave Wire 15 connected to the switch). Connect the negative (-) meter test lead to frame ground. The meter should indicate battery voltage.

3.Connect the positive (+) meter test lead to the Wire 14 terminal of the Primer Switch (leave Wire 14 connected to the switch). Connect the negative (-) meter test lead to a clean frame ground. Set the Start-Stop switch to “START”. The engine should crank and battery voltage should be measured.

4.Connect the positive (+) meter test lead to the Wire 14A termi- nal of the Primer Switch, the negative (-) meter test lead to frame ground.

a.With the Primer Switch NOT actuated, no voltage should be indicated.

b.Actuate the switch to its “PRIME” position and the meter should read battery voltage.

5.For gasoline models, disconnect Connector 2 at the Fuel Pump. Connect the VOM positive (+) test lead to Wire 14A, (Pin 2 of Connector 2) going up to the Control Panel (see Figure 7-12). Connect the VOM negative(-) test lead to frame ground. Repeat Steps 4a and 4b. Battery Voltage should be measured when the Primer Switch is activated.

TEST 19- TEST PRIMER SWITCH

DISCUSSION:

A defective primer switch can prevent the priming function from occurring.

Switch failure can also prevent the engine from start- ing, since the switch is in series with the Wire14 circuit.

(Also see “Fuel Primer Switch,” page 25).

Figure 7-11. – Primer Switch

Figure 7-12. – Harness End of Connector 2

6.For LPG models, disconnect Wire 14A from the LPG Fuel Solenoid (FS)(see Figure 7-13). Connect the VOM positive (+) test lead to Wire 14A. Connect the VOM negative(-) test lead to frame ground. Repeat Steps 4a and 4b. Battery Voltage should be measured when the Primer Switch is activated.

7.Set the VOM to measure resistance at the “Rx1” scale and zero the meter.

a.Disconnect Wire 14 from the Primer Switch.

b.Connect the meter test leads across the Wires 14 and 14A terminals of the switch.

c.With the switch NOT actuated, the meter should read “Continuity”.

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