John-deere stx38 User Manual download pdf (Page 90)

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3/21/97

THEORY AND DIAGNOSTIC INFORMATION

ELECTRICAL

COMMON CIRCUIT TESTS

Shorted Circuit:

A shorted circuit may result in the wrong component

operating (i.e. improper wire-to-wire contact). To test

for a shorted or improperly wired circuit:

1. Turn component switch ON.

2. Start at the controlling switch of the component that

should not be operating.

3. Follow the circuit and disconnect wires at

connectors until component stops operating.

4. Shorted or improper connections will be the last two

wires disconnected.

High Resistance or Open Circuit:

High resistance or open circuits usually result in slow,

dim or no component operation (i.e. poor, corroded, or

disconnected connections). Voltage at the component

will be low when the component is in operation. To test

for high resistance and open circuits:

1. Check all terminals and grounds of the circuit for

corrosion.

2. If terminals are not corroded or loose, the problem

is in the component or wiring.

Grounded Circuit:

Grounded circuits usually result in no component

operation or a blown fuse.

M85600 mif

M85601 mif

M85602 mif

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John-deere stx38 User Manual Page 90