ELECTRIC SYSTEM RT540E SERVICE MANUAL
3-6 Published 4-20-2015, Control # 502-01
NOTE: If the alternator overcharges (voltmeter reads high,
light bulbs burn out quickly), look for a ground
where one shouldn’t exist. If external wiring checks
out, replace alternator.
Troubleshooting Accessories
If the crane’s engine starts and charges properly, but none of
its components except the horn or lights work, the accessory
circuitry may be faulty. Check as follows:
1. Turn the ignition switch to ON (Position 1). Try to turn on
the cab circulating fan, the heater fan, the defroster fan,
or the windshield wipers or washer. If none of these
come on (but the head lights, tail lights, marker lights,
dome light or work light will come on), there is accessory
circuitry problem.
2. Check the primary power circuit to the accessory relay
K101 in the Cab fuse & relay panel. Make circuit repairs
as needed.
3. If the problem remains, check the ignition switch and the
accessory control circuit from the ignition switch through
the coil of the accessory relay (KS1) to ground. Turn the
ignition switch to ON (Position 1) and shift the electric
shifter to reverse; if the backup lights and backup alarm
do not turn on, then there is no power through the switch
when it is on (Position 1). Replace ignition switch if there
is no power through it when it is ON (Position 1).
Replace accessory relay if there is no continuity through
it’s coil. Make circuit repairs to accessory control circuit
as needed.
4. If the problem remains, check the accessory relay
(K101) contacts and the accessory power circuit.
Replace relay if its contacts stay open when the coil is
energized. Make circuit repairs as needed.
Reference Only
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