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Discussion Starter · #1 · (Edited)
To start off. Wiring makes the voices in my head very angry.:eek:
With that said.
The cloth cover on my tired old 70 T120R has Red/yellow (Originally white?) "X's" woven into it.
The new replacement harness I bought has Green dots. Apparently
this is supposed to be correct. Just wondering if someone may have
replaced with TR6 harness.
Please help before I climb a University Bell Tower.
 

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Yup, I had the same thing. My old ahrness was black with white and red markings and my new one is black with green markings.

Oh well, I quess that's how they are making them today. Besides Green matches the Spring Gold color of my bike.:D
 

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Discussion Starter · #3 ·
Thats what I was afraid of. Someone may have spliced the TR6
harness into mine in the distant past. This will certainly increase
my difficulty. I've found 2 part #'s so far for the 1970 year bikes.

Anyone with a T120R like to have a look see at their harness?
 

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Just checked my 70 it has a black cloth covering with red and yellow markings. Guess you could say X's. This harness is not the original but was a NOS Lucas part when installed in the early 80's when the bike was redone. I have another new one here someplace but cant lay my hands on it right now. (I misplaced that like I lost my NOS UK Silver Jubliee gas tank which is MIA (DAGAD I did find my T140 rearsets last year and I WILL GET THEM ON THIS YEAR maybe))
Anyway shrugger There were two part numbers used in '70 for the 500/650 twins wiring looms. The T100C/TR6C used #54957096 while the T100R/T120R/TR6R used #54957095. The only difference I ever found was the "C" Models had a kill switch in the system.

By the way if you climb the Tower and jump please adjust your will to leave your bike to me

Thank you for your consideration

K
 

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Just checked my 1970 T120R, which I know has the orginial harness. It is black with whith and red fibers woven in to give an "X" pattern
 

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Discussion Starter · #7 ·
...and then the confusion set in.:p
I could have swore it's been stated somewhere "Just like
the originals, made in England on the original wire looms"

You'd assume the cloth covers would also fall under that
statement.:rolleyes:


And So you know. One doesn't jump from a University Bell tower.
But after the SWAT team eventually takes me down. Then the
bike is all yours. Just make sure they know that it was the wiring
that caused me to snap.:D
 

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Discussion Starter · #8 ·
70 T120R wiring

Alrighty, got a sweet colored diagram from http://www.kojaycat.com
It shows the actual wire colors as well as pix of what they go to.
Very easy and pretty cool.:)

I've ID'd most of the wires in the new harness But I've got one
thats got me stumped. It may go to the ignition. However I
can find no referance to it in the diagram or shop manual.
And since the bike has the wires spliced into a cheap plastic
non-OEM ignition switch. It's not much help either. It be the
White/Brown wire in the pic.
Also, any idea which plug goes onto which ignition post:confused:
 

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According to the diagrams I have available for the 70, I think it goes to pin 4 on the light toggle switch. If you have the rotary switch, it goes to pin 2. There should be continuity from the white/brown wire to the white double wire connection but not the brown/white (when unplugged). The double brown and white will have power to it if the battery is connected so disconnect before making checks. I'd connect the thick brown/white double to the single terminal of the ignition switch and the thick double white/white to the double terminal of the switch. Put a blank terminal on the empty post of the switch.
 
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