Headlight shuts off when switching on high beam
Thread Starter
|
2nd Gear
Joined: Feb 2021
Posts: 6
Likes: 2
From: Guam
Headlight shuts off when switching on high beam
Good day brothers. Just picked up a beautiful 2006 FLHTCUSE with about 54000 miles on it and all seems good with exception of the high beam issue.
Headlight and aux lights up front work fine when the low beam is on but all three turn off when I switch to high beam. Originally thought it was a bad bulb but still have the same problem with a new one installed.
Have not checked voltage at the plug yet but will later today. Any suggestions?
Thanks and have a great day.
Headlight and aux lights up front work fine when the low beam is on but all three turn off when I switch to high beam. Originally thought it was a bad bulb but still have the same problem with a new one installed.
Have not checked voltage at the plug yet but will later today. Any suggestions?
Thanks and have a great day.
Club Member
Joined: Sep 2010
Posts: 15,435
Likes: 7,127
From: Beyond Fucital
Check for voltage at the socket in high beam.
When in high beam the power to the low beam turns off, this also controls the Aux lights power.
Some states require the Aux/driving lighting not be on when the high beams are on.
This can be rewired to override but that's not your issue right now.
So, check for voltage at the socket in the bucket then start tracing the wire back towards the switch.
When I had a similar problem, it was at the plug under the tank.
When in high beam the power to the low beam turns off, this also controls the Aux lights power.
Some states require the Aux/driving lighting not be on when the high beams are on.
This can be rewired to override but that's not your issue right now.
So, check for voltage at the socket in the bucket then start tracing the wire back towards the switch.
When I had a similar problem, it was at the plug under the tank.
Seasoned HDF Member
Joined: Sep 2017
Posts: 12,254
Likes: 4,946
From: England
Wiring diagrams here - https://serviceinfo.harley-davidson....75f7df5e!!4!55
Measuring voltages at the headlamp bulb connector you will most definitely have 12volts between the yellow and black wire. Check for the same across the white and black wires with the Hi-Lo beam switch in the Hi position.
Take it from there and trace back through the loom, unless it is the bulb that is faulty.
Does the high beam indicator on the dash light up? If not it would point to the problem possibly being back at connector 24.
Measuring voltages at the headlamp bulb connector you will most definitely have 12volts between the yellow and black wire. Check for the same across the white and black wires with the Hi-Lo beam switch in the Hi position.
Take it from there and trace back through the loom, unless it is the bulb that is faulty.
Does the high beam indicator on the dash light up? If not it would point to the problem possibly being back at connector 24.
Last edited by Andy from Sandy; Dec 18, 2022 at 07:33 AM.
Seasoned HDF Member
Joined: Sep 2017
Posts: 12,254
Likes: 4,946
From: England
What was written in post #1 suggests high beam isn't working.
Last edited by Andy from Sandy; Dec 18, 2022 at 11:49 AM.
Trending Topics
Thread Starter
|
2nd Gear
Joined: Feb 2021
Posts: 6
Likes: 2
From: Guam
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Thread Starter
|
2nd Gear
Joined: Feb 2021
Posts: 6
Likes: 2
From: Guam