JLG 150HAX ANSI Service Manual - Manual (Page 146)

SECTION 6 - SCHEMATICS
6-18 – JLG Lift – 3120679
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Table 6-6.Electrical System - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
PLATFORM CONTROLS
No power to platform controls.
20 Amp self-reset circuit breaker open. Check footswitch to ensure that both switches
are making contact when pedal is depressed.
Repair or replace footswitch as necessary.
Contact block in footswitch malfunctioning. Repair, replace or adjust contact block as
required.
Faulty power circuit wiring. Check wiring continuity. Refer to proper wiring
diagram.
ENGINE STARTER SYSTEM
Starter will not crank.
Discharged battery or loose battery terminals. Check and charge battery or replace battery as
necessary. Clean and
secure battery terminals.
Starter relay faulty or faulty relay connections. Using a test meter, check relay coil terminals for
presence of electrical power and for energization
of relay coil. Also check relay terminals for cor-
rect switching of contacts. Replace relay as nec-
essary.
Malfunctioning starter solenoid or motor. Replace solenoid or motor in accordance with
applicable manufacturer’s manual.
Malfunctioning ignition switch. Using a test meter, check ignition switch for cor-
rect switching of contacts. Replace switch as
necessary.
Faulty ignition and/or starter circuit wiring. Check wiring continuity. See proper wiring dia-
gram.
INSTRUMENTS AND INDICATORS
Ammeter inoperative.
Damaged wiring in circuit. Repair or replace wiring.
Ammeter not functioning properly. Replace ammeter.
Defective charging circuit components Check charging system for correct output.
Repair or replace as necessary.
Voltmeter inoperative.
Broken wire/faulty voltmeter. Repair or replace as necessary.