John Deere stx38 - Manual (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