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Test 21 – check power supply to wire 56, Test 22 – check starter contactor relay – Generac Power Systems Recreational Vehicle Generator 5413 User Manual

Page 49

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Section 7

DIAGNOSTIC TESTS

CONTINUITY

DEPRESSED
AWAY FROM
TERMINAL BEING
TESTED

8

1
2

3

7

4
5

6

0000

Figure 7-18. – Test 20, Step 6

RESULTS:
1. If “Continuity” is not measured in Step 3, repair,

reconnect or replace Wire 0 (between Start-Stop

Switch and ground terminal) as necessary.

2. If the Start-Stop Switch (SW1) failed any part of

Steps 2 or 3, replace the switch.

5. If switch tests GOOD, go to Test 21.

TEST 21 – CHECk POWER SUPPLY TO

WIRE 56

DISCUSSION:
If battery voltage is available to the Printed Circuit

Board in Test 18, then DC voltage should be deliv-

ered to Wire 56 when the Start-Stop Switch is set to

“START” (Test 20). This test will check to see if the

Printed Circuit Board is delivering battery voltage to

the Wire 56 terminal.

PROCEDURE:
1. Set a VOM to measure DC voltage (12 VDC).
2. Disconnect Wire 56 from its Starter Contactor

Relay terminal.

3. Connect the meter positive (+) test lead to the

disconnected end of Wire 56. Connect the other

test lead to frame ground. No voltage should be

indicated.

4. Actuate the Start-Stop Switch to its “START” posi-

tion. The meter should indicate battery voltage. If

battery voltage is present, stop the procedure.

5. Connect the VOM positive (+) test lead to Wire 56

(Pin Location j1-9) at the Printed Circuit Board.

Connect the other test lead to frame ground.

6. Actuate the Start-Stop Switch to the “START”

position. The meter should indicate battery volt-

age.

RESULTS:
1. If battery voltage was measured in Step 6, but not

in Step 4, repair or replace Wire 56 between the

Printed Circuit Board and Starter Contactor Relay.

2. If battery voltage was not available in Step 6,

replace the Printed Circuit Board.

3. If battery voltage is available in Step 4 but engine

does not crank, go to Test 22.

TEST 22 – CHECk STARTER CONTACTOR

RELAY

DISCUSSION:
If battery voltage is available to Wire 56 but the engine

won’t crank, the possible cause could be a failed

Starter Contactor Relay.

COM

NO

16

13

56

0

13

16

0

56

Figure 7-19. – Starter Contactor Relay

PROCEDURE:
1. Set the VOM to measure resistance (“R x 1”

scale). Remove Wire 0 from the Starter Contactor

Relay (SCR). Connect one meter test lead to

Wire 0, and connect the other meter test lead to

frame ground. “Continuity” should be measured.

Reconnect Wire 0.

2. Set the VOM to measure resistance (“R x 1”

scale). Disconnect Wire 16 and Wire 13 (Wire 13

is 12 VDC isolate from ground) from the Starter

Contactor Relay (SCR). Connect one meter test

lead to an SCR terminal, and connect the other

meter test lead to the remaining SCR terminal.

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