New Holland T8010 Manual page 1338

Exterior Lighting System Circuit Operation
Exterior lighting consists of the following:
• Headlights (high beam, low beam and center)
• Turn signals front and rear
• Tail lights
• Left and right marker lights
• Cab fender work lamps
• Cab front roof work lamps
• High intensity discharge lamp (optional)
• Cab rear fender work lamps (optional)
• Cab beltline work lamps (optional)
• Cab rear roof work lamps (optional)
The various lamps are controlled by switches and
operated via relays as follows:
Exterior Lighting System Circuit Troubleshooting
Before troubleshooting the Exterior Lighting system
make sure that the following operating conditions are
met:
• The batteries are fully charged and all connec-
tions are clean and tight.
• Transmission in neutral or park.
• Check all connectors for full installation, loose,
corroded, pushed out, or bent terminals.
NOTE: Refer to Electrical Schematic sections 24 through 35.
Section 55 - Electrical System - Chapter 1
EXTERIOR LIGHTING SYSTEM
55-1-157
• Head lamps use unswitched power and are
usable whether the ignition is On or Off.
• The road lights/flashers (Headlight) switch has
three positions, Off, On and Headlights.
• When the headlight switch is in the On or Head-
light position the left and right tail fender lights,
roof warning lights and the left and right marker
lights are On.
• The work lamp (Rotary) switch controls the
optional beltline work lamps, center and optional
fender work lamps, center and side work lamps,
rear work lights and front roof work lamp and
high beams.
• The rotary switch controlled lamps are locked out
when the headlight switch is On.
• Fuses 3, 4, 5, 6, 18, 20, 22, 23, 53, and 54 are
intact and have power.
• If one of the work lamp circuits is not working, try
swapping a relay from a working system for a
quick and easy relay check. Otherwise, follow the
circuit diagnostic tests to determine the fault.
• If a bulb is not working, substitute with a known
good bulb to verify circuit operation.