Section 7

DIAGNOSTIC TESTS

RESULTS:

1.If battery voltage is NOT indicated in Step 1, check continuity of:

a.Wire 13 between Starter Contactor and Starter Contactor Relay.

b.Wire 13 between Starter Contactor Relay and 7.5 Amp Fuse (F1).

c.Wire 15 between the 7.5 Amp fuse (F1) and the Battery Charge Rectifier.

d.Wire 15 between the Battery Charge Rectifier and the Engine Controller Board.

Repair, reconnect or Replace bad wiring as necessary.

2.If battery voltage is indicated but engine will not crank, go to Test 24.

3.If “Continuity” was not measured in Step 3, repair or replace Wire 0 between the Engine Controller Circuit Board and the Ground Terminal.

TEST 24 - CHECK START-STOP SWITCH

DISCUSSION:

Engine cranking and startup is initiated when Wire 17 from the Engine Controller board is connected to frame ground by setting the Start-Stop Switch to “START”.

Engine shutdown occurs when circuit board Wire 18 is connected to frame ground by the Start-Stop Switch.

Figure 7-17. – Start-Stop Switch

A defective Start-Stop Switch can result in (a) failure to crank when the switch is set to “START”, and/or (b) failure to shut down when the switch is set to “STOP”.

PROCEDURE:

For Problem 6 (Section 6), perform all steps. For Problem 9, perform Step 1 and Step 5 ONLY.

1. Set a VOM to its “Rx1” scale and zero the meter.

2.Inspect the ground Wire 0B, between the Start-Stop Switch and the grounding terminal. Connect one meter test lead to Wire 0B on SW1. Connect the other test lead to a clean frame ground. “Continuity” should be measured.

3.Disconnect Wire 17 from its Switch terminal and connect it to frame ground. The engine should crank.

4.Remove the 7.5 amp fuse. Disconnect Wire 18, Wire 0B and Wire 17 from the Start-Stop Switch (SW1).

5.Connect one test lead to the center terminal of SW1. Connect the other test lead to an outer terminal of SW1. “Infinity” should be measured. Remove the test lead from the outer terminal of SW1 and connect it to the opposite outer terminal. “Infinity” should be measured.

6.Leave the test lead connected to the center terminal of SW1 from Step 5. Connect the other test lead to an outer terminal. Depress the switch away from the terminal being tested (see Figure 7-18). “Continuity” should be measured. Repeat the pro- cedure with the test lead connected to the other outer terminal. “Continuity” should be measured.

Figure 7-18. – Test 24, Step 6

RESULTS:

1.If “Continuity” is not measured in Step 2, repair, reconnect or replace Wire 0B (between Start-Stop Switch and ground termi- nal) as necessary.

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Generac Power Systems 75, 55, 65 manual Test 24 Check START-STOP Switch, Start-Stop Switch
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