New Holland WorkMaster 50 Service Manual page 713

Instrument cluster - Troubleshooting
Problem
Warning lights and
gauges inoperative
Gauges erratic or
inoperative
Warning lights not
illuminating
Gauges always show
maximum reading
Erratic tachometer
reading
Electrical systems - Warning indicators, alarms, and instruments
Possible Cause
Blown #6 15 A fuse.
Faulty ground circuit.
Faulty sender.
Bulb is burned out
Sender wire damaged
Faulty sender
Sender wire shorted to ground.
Fan belt slipping.
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Correction
Replace fuse.
Check ground connections for proper con-
tact.
Check sender for proper operation.
Replace bulb
Check wiring harness for damage
Check sender for proper operation
Check sender wire for damage.
Tighten fan belt.