Lighting System

LIGHTING SYSTEM

A. Circuit Diagram

Above circuit diagram shows only lighting circuit in wiring diagram.

B. Lighting Tests and Checks

The battery provides power for operation of the headlight, taillight, and meter lights. If none of the above operates, always check battery voltage before proceeding further. Low battery voltage indicates either a faulty battery, low battery water, or a defective charging system. See page 113 "CHARGING SYSTEM" for checks of battery and charging system. Also check fuse condition. Replace any "open" fuses. There are individual fuses for various circuits (see complete Circuit Diagram).

NOTE:

Check the headlight bulb first before performing the following check.

1. Headlight check NOTE:

When the engine is started, the headlight and meter lights come on automatically and the lights stay on until the main switch is turned to "OFF" even if the engine stalls.

HEADLIGHT DOES NOT COME ON WHEN ENGINE IS RUNNING

Check for voltage on "W" wire to safety relay

----------->
No voltage

Check AC generator, diode, or wiring circuit


Voltage OK

Check for battery voltage (12V) on "R/Y" wire to headlight relay

----------->
No voltage

Check fuse "Head or wiring circuit

Voltage OK

Check for battery voltage (12V) on "L/B" wire from headlight relay

----------->
No voltage

Replace headlight relay

 

HIGH BEAM AND/OR LOW BEAM DO NOT LIGHT

Check for battery voltage at dimmer switch terminal

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No voltage

Dimmer switch defective

Voltage OK

Check for battery voltage at headlight high beam or low beam terminal

----------->
No voltage

Open or poor connection between headlight and dimmer switch terminal

Voltage OK

Poor ground or poor connection of headlight wiring

2. Taillight does not work: 

a. Check bulbb

b. Check for 12V on blue wire.

c. Check for ground on black wire to tail/brake light and/or license light assembly.