Headlamp Switch Wiring Question 1971 T100c - Triumph Forum: Triumph Rat Motorcycle Forums
» Main Menu

Discussion Forums
 » Twins
 » Tiger
 » General
 » RAT

Features
 » Blogs

Motorcycle.com Links

Contribute
 » Photo

Motorcycle Forums
» Insurance
» Sponsors
» Our Partners
»ATV Reviews
»Motorcycle Games

Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

Reply
 
LinkBack Thread Tools Display Modes
Old 03-03-2012, 11:52 PM   #1 (permalink)
Lifetime Premium
Site Supporter
Powerbike
Main Motorcycle: '03 Bonneville
 
TheFixer's Avatar
 
Join Date: Jun 2009
Location: Hudson Valley, NY
Posts: 334
Other Motorcycle: 1971 Triumph Trophy
Headlamp Switch Wiring Question 1971 T100c

Hi all. Finally closing in on the finishing steps of of 1971 T100c rebuild. I've consulted my maintenance manual, Haynes manual, & Building British Bikes books and I am still not 100% confident on this one. Need some wiring help, please.

I purchased a reproduction harness to replaced the crusty "and modified" loom that came with the bike.

My 3 position headlamp switch has 6 spades instead of 8 like the wiring diagram suggests.

1 2
3 4
5 6


I have four wires with connectors in the headlamp shell:
Brown/Blue = ignition
Brown/Green (double wires) = speedo/tail lamp
White/White (double) = ignition
Blue/Blue = headlamp

I don't have a red/black wire as the manual suggests for 4. But, it appears he pilot bulb shares the same wiring (brown/green) as the speedo/tail lamp. I suspect the pilot wire (red/black) in the manual isn't required since the pilot will now be powered at the same time as the speedo/tail lamp?

I cannot find a double white/white referenced anywhere in my manuals though and am at a complete loss on this one.

I think it should be:

1:No wires
2:Brown/Blue = ignition
3: No wires
4:??
5: Brown/Green = speedo/tail lamp
6: Blue/Blue = headlamp

Can someone confirm if this is correct?
__________________
My '03 Bonnie: Custom paint (c. 1964), Eyebrow Badges, Hagon Progressive Springs, Hagon 2810 shocks, NH Togas, NH Belmouth + K&N Filter, Custom Seat, Fork Gaiters, BC Western bars, vinatge mirrors, early 60's license plate bracket + custom lighting.

Last edited by TheFixer; 03-04-2012 at 12:16 AM. Reason: more details
TheFixer is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 03-04-2012, 08:41 AM   #2 (permalink)
Senior Member
Supersport 600
Main Motorcycle: 1973 TR7RV "in prep"...
 
Join Date: Jun 2009
Location: London, England
Posts: 187
Other Motorcycle: Ducati SportClassic 1000
Extra Motorcycle: Ducati Monster 695
White wires should mean "switched power from ignition switch" that is they only carry power when ignition is on. Check that is the case.
Brown/blue wires should mean "always live" Check that is the case.
These headlamp switches are pretty simple and you need to check that the three positions provide the following;
Position 1 = nothing. Terminals 1 and 2 are connected but there are no wires going to either so nothing happens, everything off.
Position 2 = Pilot and Tail. Terminals 3 and 4 connected. Brown Blue to terminal 3, Brown/Green to terminal 4.
Position 3 = Headlamp hi/lo AND Pilot and tail. Terminal 3 and 4 and 5 and 6 connected. White to terminal 5 Blue to terminal 6.
You might find that Position 3 does NOT connect terminals 3,4,5 and 6 together. If that is the case you will have to make a wire to connect terminal 6 to terminal 4 to provide current to the tail light when the switch is in position 3.
You need to get your multi meter out to work out what is happening inside your switch then draw it out on paper. before you start wiring it up. That works for me.
Good luck.
Adam.
__________________
http://tiger750.wordpress.com/
Please support The Ruby Lambert Trust:
http://www.one4ruby.com/
Triumph5ta is offline   Reply With Quote Quick reply to this message
Old 03-05-2012, 08:29 AM   #3 (permalink)
Senior Member
Supersport 600
Main Motorcycle: 1973 TR7RV "in prep"...
 
Join Date: Jun 2009
Location: London, England
Posts: 187
Other Motorcycle: Ducati SportClassic 1000
Extra Motorcycle: Ducati Monster 695
On all Triumph looms I have seen the double white wire is doing two things:
It is bringing power from the ignition switch to the headlamp switch from where it is passed to the headlamps.
It also sending power onwards, independent of the headlamp switch, to a front brake light switch. If you do not have a front brake light switch do not worry about it.
Adam.
__________________
http://tiger750.wordpress.com/
Please support The Ruby Lambert Trust:
http://www.one4ruby.com/
Triumph5ta is offline   Reply With Quote Quick reply to this message
Old 03-05-2012, 09:03 AM   #4 (permalink)
Lifetime Premium
Site Supporter
Powerbike
Main Motorcycle: '03 Bonneville
 
TheFixer's Avatar
 
Join Date: Jun 2009
Location: Hudson Valley, NY
Posts: 334
Other Motorcycle: 1971 Triumph Trophy
Thanks T5ta. I do not have a front brake light switch on mine. I have it wired now per your suggestion - just need to test it. I'll let you know it goes when I get it sorted out. Appreciate the input.
__________________
My '03 Bonnie: Custom paint (c. 1964), Eyebrow Badges, Hagon Progressive Springs, Hagon 2810 shocks, NH Togas, NH Belmouth + K&N Filter, Custom Seat, Fork Gaiters, BC Western bars, vinatge mirrors, early 60's license plate bracket + custom lighting.
TheFixer is offline   Reply With Quote Quick reply to this message
Old 04-04-2012, 09:52 AM   #5 (permalink)
Lifetime Premium
Site Supporter
Powerbike
Main Motorcycle: '03 Bonneville
 
TheFixer's Avatar
 
Join Date: Jun 2009
Location: Hudson Valley, NY
Posts: 334
Other Motorcycle: 1971 Triumph Trophy
Issue solved!

I finally got this issue sorted out. The 3 position switch that the PO had installed was not wired in a way that was compatible with the original design. Using a multimeter I was able to determine that POS 1= On A, POS 2 = Off, POS 3 = On B. Because of this set up, I had of choice of either having the tail light/instruments on OR the headlights on, but not both.

I ultimately replaced the switch with a reproduction of the original. My reproduction wiring harness differs slightly from the original as it has integrated the headlight bucket wiring and the main harness into one complete loom. Becasue of this, I had to deviate slightly from the original wiring diagram. The image below shows the end result which is now working properly.

The only issue is that because the Brown/Blue wire is connected to the switch and it is always on, the lights will power on in POS 2 (tail/instruments) and POS 3 (tail/instruments + headlights) without the ignition being turned on. The only way to avoid this is to exclude that wire from the switch completely.




One last thing: My '71 does has a front brake switch. I misspoke in my last post.
__________________
My '03 Bonnie: Custom paint (c. 1964), Eyebrow Badges, Hagon Progressive Springs, Hagon 2810 shocks, NH Togas, NH Belmouth + K&N Filter, Custom Seat, Fork Gaiters, BC Western bars, vinatge mirrors, early 60's license plate bracket + custom lighting.
TheFixer is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
1971 Trophy T100C - aboutadog The Welcome Center 5 09-24-2010 04:20 AM
1971 T100c Fuel Question TheFixer Classic, Vintage & Veteran 6 05-07-2010 08:09 PM
1971 T100C Trophy top end rebuild toxic Classic, Vintage & Veteran 16 04-25-2010 02:54 AM
Wiring help in headlamp and ignition switch Kev_England Classic, Vintage & Veteran 62 01-14-2010 12:48 PM
t100c 1971 LegendTT99 Classic, Vintage & Veteran 1 02-14-2007 04:24 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 03:21 AM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Forum Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum Ninja H2 Forum Ducati Scrambler Forum Kawasaki Ninja 250SL Forum

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.