'72 T100R wiring questions - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 19 (permalink) Old 10-10-2019, 09:47 PM Thread Starter
Minitwins
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'72 T100R wiring questions

okay guys may be in the wrong section, but I am rebuilding a 72 daytona T100R , motor rebuilt and new harness battery etc. problem I am having is the wiring have the manual for the bike , but for going batty, no handlebar controls have the horn head light switch hooki'd up headlight working as it should, but have no juice going to coils, have hooked up the kill switch as of yet still trying to figure what is what on that note, but everything is new, and I am running fuse's on both neg and positive , I realize everything is reversed on these bikes but can anyone help out with a simple wiring diagram with the color codes ??? all help will appreciated.
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post #2 of 19 (permalink) Old 10-10-2019, 10:19 PM
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Quote:
Originally Posted by skypilot56 View Post
okay guys may be in the wrong section, but I am rebuilding a 72 daytona T100R , motor rebuilt and new harness battery etc. problem I am having is the wiring have the manual for the bike , but for going batty, no handlebar controls have the horn head light switch hooki'd up headlight working as it should, but have no juice going to coils, have hooked up the kill switch as of yet still trying to figure what is what on that note, but everything is new, and I am running fuse's on both neg and positive , I realize everything is reversed on these bikes but can anyone help out with a simple wiring diagram with the color codes ??? all help will appreciated.
http://www.classicbike.biz/Triumph/R...0cc-Repair.pdf

Quick fixes are named after how long they stay fixed, not how long it takes to make them.
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post #3 of 19 (permalink) Old 10-11-2019, 11:31 AM Thread Starter
Minitwins
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Thanks showed a tad bit more than the manual I have which is suppose to be the one for this bike, just trying to get things right so I don't screw the pooch so to speak on the electronics , been working on American Iron long time but this British Iron , will try ones sanity !!! L.O.L what I am find is the bike didn't have the original handlebar control's right side from the rear just has the cut off button and the left has the dimmer switch and horn button combined , what I am trying is to keep it as stock as I can but am finding three or 4 diagrams as to what was he correct one, do I have to go by the stater number to correct this again a newbie when doing British iron,
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post #4 of 19 (permalink) Old 10-11-2019, 09:25 PM Thread Starter
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'72 T100R wiring questions

in the middle of a complete rebuild on my 72 T100R, bought a new harness all new electronics , coils, capacitors , battery, etc. , motor is a fresh rebuild, , now the wierd, no handlebar controls or turn signals, right side has kill button , and according to wiring diagram connects to white and brown, ? driving me nuts, and the left side just has the old style horn button and dimmer , have all the lights working but cannot get the horn to work by the manual diagram , I know I am screwing the pooch, but worst item is no fire to the coils or points , if someone has a diagram that will help out would appreciate it , because color me crazy I cannot figure this factory diagram out seems it tells you one way to do it and I get the reverse , I have the red grounds connected as they should be, so if someone can help out would be cool thanks
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post #5 of 19 (permalink) Old 10-12-2019, 12:42 AM
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British Wiring (http://www.britishwiring.com) has just about everything you need: wiring harnesses, bullet connectors, wire, tools, harness tape, etc.

I have used one of their harnesses and it matched the original in every way. I've also used their components to make my own harness. The PVC harness tape works really well - no adhesive.

Bruce Miller (hermit47)
'69 T120R
www.hermit.cc/tmc
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post #6 of 19 (permalink) Old 10-12-2019, 04:57 AM
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Hi Buzz,

Quote:
Originally Posted by skypilot56 View Post
no handlebar controls or turn signals, right side has kill button
left side just has the old style horn button and dimmer
These:-





... the kill button inside a chromed holder attached to the handlebars with two clips, screw'n' nut? If so, you have pre-'71 switches; they're in the wiring diagram on .pdf page 246 (manual page HH4) of the .pdf Peg linked for you.

Quote:
Originally Posted by skypilot56 View Post
right side has kill button
according to wiring diagram connects to white and brown
Uh-uh. As you've posted you're working with a '72 T100R harness, one kill button wire should be connected to the White/Yellow (WY) wire to the coils, the other kill button wire should be connected into the White (W) wires multi-way bullets snap connector (one White wire is connected from the multi-way to the ignition switch; White wires are (should be) energised when the ignition switch is 'on').

Quote:
Originally Posted by skypilot56 View Post
left side just has the old style horn button and dimmer
cannot get the horn to work by the manual diagram
Pending an answer to my question above about the horn/dimmer switch, likely you won't - the horn was wired completely differently '71-on (your harness) and pre-'71 (likely your switch). Once you've answered that question, I might be able to suggest a way of doing it.

Quote:
Originally Posted by skypilot56 View Post
red grounds connected as they should be,
Be aware that, unlike most other makers, Lucas and Triumph didn't use the cycle parts as "ground"; the Red wire connections are (should be) to specific electrical components (sometimes using their mountings) and it's the Red wires' network that's the main electrical return to battery +ve, not the frame or other cycle parts.

Hth.

Regards,

Stuart
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post #7 of 19 (permalink) Old 10-13-2019, 10:11 AM Thread Starter
Minitwins
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Thank you so much for the help, I got this bike after 3 different people worked on it and was told everything was 72, and I was going by the triumph work manual that came with it , no wonder I have been going nuts did not realize the issue , and as I said I went by the wiring diagram to hook up the dimmer switch and horn button got the lights and brake lights to work and the horn button was the issue on the dimmer switch , and of course no fire going down to the pionts, thank you for helping out
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post #8 of 19 (permalink) Old 10-13-2019, 10:44 AM Thread Starter
Minitwins
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And yes the Harness is for a 72 as I was led to believe and the wiring is off , when I use a fluke meter on it the black & red beep out when you push on the horn button,
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post #9 of 19 (permalink) Old 10-13-2019, 02:58 PM
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Hi Buzz,

Pleased I could help.

Quote:
Originally Posted by skypilot56 View Post
when I use a fluke meter on it the black & red beep out when you push on the horn button,
This isn't clear ...

If you've a Fluke meter and definitely the "horn button"-'n'-"dimmer switch" I pictured in my previous post:-

. First ensure the horn doesn't 'ground' through its mounting - measure between the mounting and each terminal in turn, you hope to see thousands of or infinite Ohms; if there's any continuity between the mounting and either terminal, the following won't work.

. Connect between the existing Brown/Blue (NU) wire and one horn terminal. If the back of your bike's ignition switch looks like this:-



... and the horn's in the standard T100 position between the frame tubes above the engine and under the front of the tank, maybe connect from the unused ignition switch terminal beside the Brown/Blue wire to one horn terminal?

. Connect the existing harness Purple/Black (PB) wire to the other horn terminal. Do not connect a Red wire to any horn terminal.

. Connect the other end of the harness Purple/Black wire to the wire in the horn button/dimmer switch that isn't used by the headlamp. If the switch you have has 'correct' wire colours, the pre-'71 horn button wire is Brown/Black (and the other wires are Blue/Red, Blue/White and plain Blue); otoh, if the switch is the more-common shonky crap, an educated guess says the horn button wire is plain Black (and the other wires are Yellow, Green and White)?

. Bear in mind the electrical return path from this horn button to battery +ve is through the switch body, its screws into the handlebars and then some indeterminate sets of contacts between sundry other bits of bike; if you think that sounds less-than-ideal ... Best improvement is: identify where the horn button makes contact with the switch body, connect a (Red?) wire there, route it alongside the other wires to/from the switch and connect it somewhere unobtrusive to the existing harness Red wires. Failing that, a (Red?) wire connected between somewhere near the switch and the existing harness Red wires?

Hth.

Regards,

Stuart
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post #10 of 19 (permalink) Old 10-14-2019, 12:06 AM Thread Starter
Minitwins
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will try this in the AM again thank you for your help and I am sure that I may have other questions for you, again thank you !!
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