Lights/Meters/Switches Troubleshooting; Low Beam Headlights Do Not Light With The Ignition Switch Turned To “On”; Low Beam Headlights Go Off During Reverse Running; Left High Beam Headlight Does Not Light With The Dimmer Switch Pushed To - Honda GL1800 Service Manual

LIGHTS/METERS/SWITCHES
TROUBLESHOOTING
• Check the following before troubleshooting:
– faulty or under-charged battery
– blown main fuse B (100 A) and No. 2 main fuse A (30 A)
– Check the ignition switch and its circuit if all systems do not function when the ignition switch is turned to "ON."
• Check for open circuit in the Green (ground) wire for each part.

LIGHTING SYSTEM

• The headlights go off when the starter/reverse switch is pushed for starting.
• The low beam headlights remain on when the starter/reverse switch is pushed for reverse running.
Low beam headlights do not light with the ignition switch turned to "ON"
• Faulty bulbs
• Faulty HEADLIGHT LO relay (page 20-16)
• Faulty starter/reverse switch (page 20-35)
• Faulty diode (D21)
• Blown No. 9 fuse or No. 26 fuse (Check for a short circuit in the related wires if the fuse is blown again.)
• Loose or poor contact of related connectors
• Open circuit in related wires

Low beam headlights go off during reverse running

• Open circuit in the Blue wire between the headlight LO relay and reverse regulator assembly
• Faulty diode (D8) (page 19-28)
• Open circuit in the White/blue wire between the reverse position switch and reverse regulator assembly
• Loose or poor contact of related connectors
Both high beam headlights do not light with the dimmer switch pushed to "
• Faulty dimmer switch (page 20-36)
• Open circuit in the Blue/white wire between the starter/reverse switch and dimmer switch

Left high beam headlight does not light with the dimmer switch pushed to "

• Faulty bulb
• Open circuit in the Blue wire between the left headlight and dimmer switch
• Loose or poor contact of related connectors
Right high beam headlight does not light with the dimmer switch pushed to "
• Faulty bulb
• Faulty HEADLIGHT HI relay (page 20-16)
• Blown No. 24 fuse (Check for a short circuit in the related wires if the fuse is blown again.)
• Loose or poor contact of related connectors
• Open circuit in related wires
Taillights and meter lights do not light with the ignition switch turned to "ON"
• Faulty TAIL relay (page 20-16)
• Blown No. 5 fuse (Check for a short circuit in the related wires if the fuse is blown again.)
• Loose or poor contact of related connectors
• Open circuit in related wires
Brake lights do not come on when the brake is applied with the ignition switch turned to "ON"
• Faulty brake light switch (page 20-37)
• Faulty STOP LIGHT relay (page 20-16)
• Faulty HORN TURN relay (page 20-16)
• Blown No. 18 fuse (Check for a short circuit in the related wires if the fuse is blown again.)
• Loose or poor contact of related connectors
• Open circuit in related wires
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