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Generac Power Systems Recreational Vehicle Generator 5413 User Manual

Page 55

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Section 7

DIAGNOSTIC TESTS

TEST 27 – CHECk WIRE 18

DISCUSSION:
Wire 18 controls sending the STOP signal to the

Printed Circuit Board. Coach manufacturers some-

times install a 15 to 30 foot remote harness. If unit

shuts down or will not start, a possible ground exists

on Wire 18.

PROCEDURE:
1. Disconnect the customer installed remote harness

connector from the generator. Then press the gen-

erator Start-Stop switch to the “START” position.

If generator starts and continues to run, a short

is present in the coach remote harness. Repair or

replace the remote harness.

2. Remove the j1 connector from the Printed

Circuit Board. Set the VOM to measure resis-

tance. Connect one test lead to Pin Location j1-

2. Connect the other test lead to a clean frame

ground. “Infinity” should be measured.

WIRE 18

AT PIN LOCATION B

E

G

F

H

A
B

C
D

Figure 7-31. – Remote Harness Connector

3. Connect one test lead to Pin Location B on the

Remote Harness connector (see Figure 7-31).

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 shorted Wire 18 between j1 Connector

and remote panel connector.

3. If Wire 18 checks GOOD, proceed to Problem 8

(Section 6).

TEST 28 – 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 47).

2. Remove air filter cover. Disconnect Connector 2

which connects 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 solenoid

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 posi-

tive (+) 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 connec-

tor. 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 mea-

sured.

6. Connect one test lead to the Green Wire going to

the carburetor. 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 connector 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 measured, 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 Connector

and the Fuel Solenoid.

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