FUEL LEVEL GAGE

TM 5-2420-222-20-1

INDICATOR AND WARNING ELECTRICAL CIRCUITS - CONTINUED

FUEL LEVEL GAGE

Positive terminal connected by wire to positive terminal of engine oil pressure indicator light and positive terminal

of alternator indicator light.

Negative terminal connected by wire to positive terminal of fuel gage sender.

Reads resistance set up by fuel gage sender to show fuel level.

FUEL GAGE SENDER

Positive terminal connected by wire to negative terminal of FUEL level gage.

Grounded through mounting hardware to fuel tank.

Float adjusts to fuel level and sets up resistance in sender which FUEL level gage reads and shows as quantity.

HORN SWITCH

Positive terminal connected by wire to output from ac generator voltage regulator and positive terminal of cigar

lighter.

Negative terminal connected by wire to positive terminal of electric horn.

When pushed, completes horn circuit to sound electric horn.

ELECTRIC HORN

Positive terminal connected by wire to negative terminal of horn switch and number 2 terminal of parking brake

horn relay if present.

Grounded through mounting hardware to flywheel housing.

Sounds when operator pushes horn switch.

Sounds when parking brake lever is engaged and range shift lever is not in neutral on Serial Numbers 319995 thru

342573.

CIGAR LIGHTER

Positive terminal connected by wire to horn switch positive terminal.

Grounded by wire to cowl.

When pushed in, element heats up enough to light cigarettes and cigars.

PARKING BRAKE SWITCH (SERIAL NUMBERS 319995 THRU 342573 ONLY)

Positive terminal connected by wire to ignition lock switch IGN terminal.

Negative terminal connected by wire to parking brake horn relay number 1 terminal.

Normally closed switch is held open when parking brake lever is completely released.

When parking brake lever is engaged, closed switch completes circuit to parking brake horn relay and parking

brake warning light.

PARKING BRAKE WARNING LIGHT (SERIAL NUMBERS 319995 THRU 342573 ONLY)

Positive terminal connected by wire to number 1 terminal of parking brake horn relay.

Negative terminal connected by wire to ground.

Glows when ignition lock switch is on and parking brake lever is engaged closing parking brake switch.

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