Wiring loom tight at steering head, my find - Triumph Forum: Triumph Rat Motorcycle Forums
Water Cooled Twins Technical Talk Technical Talk for water cooled Triumph Twins.

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post #1 of 9 (permalink) Old 06-18-2017, 08:53 PM Thread Starter
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Wiring loom tight at steering head, my find

I have read some post of it being tight at the steering head, my finding is when turned fully to right lock it would get very tight on the steering head.
I pulled the bolt from the rear of the tank moved it back 4", on the left side there is a small clamp that holds the wiring loom. With steering straight loosened the two screws on the clamp, turn bars full right. It moved the harness a 1/2 forward! That's how tight it was at full lock right. I adjust 1/4 more forward and tightened it all back up.
Not saying all are like this, but there has been reports of wiring problems at the headlight bucket. Maybe this may take some strain of the wiring harness at the steering head.
Just my finding on my T-120
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post #2 of 9 (permalink) Old 04-01-2019, 12:25 AM
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I found the same after my oil light started coming on intermittently. On investigation, I found that when I turn the bars full right the oil light comes on and stays on for a while! The tightness has caused a loosening of the harness plugs where it goes into the clocks. Been meaning to loosen it up and I found your post. Thanks!

PS - The slight creaking of the wiring against the steering neck when full right turn is the tightness indicator. If it goes then its loosened!
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post #3 of 9 (permalink) Old 04-05-2019, 11:48 AM
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i had exactly the same issue with my Street Twin! i've taken it to the dealer so they can figure out what the problem is...
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post #4 of 9 (permalink) Old 04-05-2019, 02:12 PM
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I got a recall notice to replace the headstock tidy on my 2017 T120.
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post #5 of 9 (permalink) Old 05-08-2019, 02:38 PM
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wiring harness

So I hv had the Triumph guys check it and they put a warranty claim for a replacement wiring harness since the current one keeps showing the oil light for no reason. I shoved a lighter between the speedo and the keyhole module and that seemed to take care of the light for some time
I freed up a bit of wire from the rear of the loom and it did free up 1/2 to 1 inch of wiring to the front(by above method) but I guess the connectors are screwed. So lets hope the wiring harness change does some good.
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post #6 of 9 (permalink) Old 05-08-2019, 04:31 PM
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Quote:
Originally Posted by superpedro View Post
i had exactly the same issue with my Street Twin! i've taken it to the dealer so they can figure out what the problem is...
The replacement headstock tidy is supposed to keep the clutch cable from rubbing on the wiring harness. This has caused damage to the wiring, thus, the recall.
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post #7 of 9 (permalink) Old 05-13-2019, 12:43 AM
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Interesting. On my TTR it did the same thing. I figured it was just too tight from the factory build. The loom has extra length to accommodate the fairing. Sounds like they may be using the same loom on all bikes. Anyway, I loosened the harness turned to lock and then tightened. No more squeaking.
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post #8 of 9 (permalink) Old 05-14-2019, 07:11 PM
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I've loosened up the tidy using a longer bolt and kicked out the clutch cable on my 2017 Street Cup. So now the harness doesn't stretch so tight that it creaks anymore. But it still pulls a lot when the bars go right and then pushes back (a lot) when the bars go left. Seems like too much movement and I would still expect to see problems down the road, from all that flexing. The clutch cable may have been one identified problem but I don't think it's the whole story.

Also - other posts in this general theme have indicated wires failing at the voltage regulator. Those regulator wires look pretty stiff and, wrapped together with the rest of the harness, are probably causing a lot of needless movement in the harness overall. This is especially true since the voltage regulator doesn't need to be on the forks. Sure - it should probably see some airflow but a frame mount somewhere, say behind the radiator, should suffice. If you really want to leave it on the fork, then perhaps consider trying to separate the wires to it from the rest of the harness.

Dinking with the harness on a new bike, under warranty, may seem disconcerting, but so is the prospect of waiting til it fails and then trying to get the bike to a dealer for a replacement harness. If it's a stock harness replacement, what's changed?
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post #9 of 9 (permalink) Old 05-17-2019, 10:57 AM
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Quote:
Originally Posted by Streetiger View Post
If you really want to leave it on the fork, then perhaps consider trying to separate the wires to it from the rest of the harness.
That’s exactly what I did with my 2016 street twin, I unwrapped all the wires from under the tank up to the headlight bucket wiring, one of the wires going into the right connector into the regulator had split showing bare wire into the connector and another split about an inch above from all the movement, removed the terminal from the connector an put heatshrink over the wire and then wrapped up the two sets of wire into the reg separately and then the rest of the harness all wrapped together with new harness tape, so all in three wrapped wires now go through the headstock tidy into the harness box under the tank, should futureproof the harness for a while
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