Section 7

DIAGNOSTIC TESTS

water column as measured with a manometer. The LP system must be able to maintain 11-14 inches water column under all load requirements.

1.Turn LP supply to generator off.

2.Remove the Gas Pressure Tap from the fuel regulator and install manometer to this port.

3.Turn LP supply to generator on, the gauge should read 11-14 inches water column.

4.For Problem 8 only (Section 6), start the engine and the gauge should read 11-14 inches water column.

RESULTS:

1.If the LP gas pressure is less than 11-14 inches water column the fuel supply system must be corrected in order to maintain 11-14 inches water column.

2.If the LP gas pressure is between 11-14 inches water Column, proceed to Test 29 for Problem 7 (Section 6). Proceed to Test 32 for Problem 8 (Section 6).

Figure 7-29. – Fuel Regulator

TEST 29 - CHECK WIRE 14 POWER SUPPLY

DISCUSSION:

When the engine is cranked, Engine Controller Circuit Board action must deliver battery voltage to the Wire 14 circuit, or the engine will not start. This is because the Wire 14 circuit will operate the Fuel Pump and Fuel Solenoid on Gasoline models. On LP models it operates the LPG Shut-off valve.

PROCEDURE:

Inside the generator panel, locate the 4-tab terminal connector (Figure 7-30). Then, proceed as follows:

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

2.Connect the meter positive (+) test lead to the 4-tab terminal connector, the common (-) test lead to frame ground.

3.Crank the engine and the meter should read battery voltage. If

battery voltage is not measured, proceed to Step 4.

4.Connect the positive (+) meter test lead to Terminal J2 on the Engine Controller Circuit Board. Connect the negative (-) test lead to a clean frame ground (see Figure 5-3, Page 24).

5.Crank the engine. The meter should indicate battery voltage.

Figure 7-30. – The 4-tab Connector

RESULTS:

1.If the meter indicated battery voltage, go to Test 19.

2.If battery voltage was NOT indicated in Step 3 but is indicated in Step 5, check Wire 14 between the 4-tab connector and the Engine Controller circuit board.

a.Repair, reconnect or replace Wire 14 as neces- sary.

3.If battery voltage was not indicated in Step 5, replace the Engine Controller Circuit Board.

TEST 30 - CHECK WIRE 18

DISCUSSION:

Wire 18 controls sending the STOP signal to the Engine Controller Circuit Board. If Wire 18 contacts ground it will initiate a shutdown. Coach manufactur- ers sometimes install a 15 to 30 foot remote harness. A ground on Wire 18 in a remote harness can also cause a shutdown.

PROCEDURE:

1.Remove the remote harness connector from the generator and re-test. If generator continues to run, a short is present in the remote harness. Repair or replace the remote harness.

2.Remove the J1 connector from the Engine Controller Circuit Board. Set the VOM to measure resistance. Connect one test lead to Pin Location J1-14. Connect the other test lead to a clean frame ground. “Infinity” should be measured.

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Generac Power Systems 75, 55, 65 manual Test 29 Check Wire 14 Power Supply, Test 30 Check Wire
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65, 75, 55 specifications

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