Headlight switch test (optional), Key switch tests – John Deere stx38 User Manual

Page 154

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3/21/97

TESTS AND ADJUSTMENTS

ELECTRICAL

HEADLIGHT SWITCH TEST
(OPTIONAL)

Reason:

To make sure the headlight switch terminals have
continuity when the headlight switch is ON.

Equipment:

• Ohmmeter or Continuity Tester

Procedure:

1. Park machine on level surface and turn key switch

OFF.

2. Shift lever in NEUTRAL and park brake LOCKED.
3. Disconnect headlight switch connector.

4. Move headlight switch to the ON and then the OFF

position. Check continuity between terminals (A and
B).

Results:

• Terminals should have continuity with switch on.
• Terminals should NOT have continuity with switch

off.

• If continuity is NOT correct, replace headlight

switch.

KEY SWITCH TESTS

Reason:

To verify key switch functions are operating properly.

Equipment:

• Ohmmeter or Continuity Tester

Procedure:

1. Park machine on level surface and turn key switch

OFF.

2. Shift lever in NEUTRAL and park brake LOCKED.
3. Disconnect key switch connector.

NOTE: Key switch terminals are identified to coincide

with electrical schematic designations.

4. Use an ohmmeter to test switch continuity in OFF,

RUN, and START positions.

Specification:

Key Switch Continuity

Switch Position . . . . . . . . . . . . Terminal Continuity
OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (G and M)
RUN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (A and B)
START . . . . . . . . . . . . . . . . . . . . . . . (A and B and ST)

Results:

• If any continuity is NOT correct, replace switch.

M56813

A

B

G

A

B

M58364

M

ST

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