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Nicely fried wiring

 
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Siamese Duke
Mad Brick Rider


Joined: 26 Sep 2006
Posts: 89

PostPosted: Thu May 05, 2011 11:59 am    Post subject: Nicely fried wiring Reply with quote

Been a long while since I posted here, but...

http://www.neil_murray.fastmail.fm/Wiringbodge1.jpg

That's my LT on a French autoroute last weekend after it suddenly died and smoke started pouring out from behind the right-hand panel.

The fried wiring was cut back to bare copper wires. A Swiss Army kniofe was used to slice some plastic HazMat tape into strips. The tape was used to fashion new insulation. An hour or so after the breakdown, it was running again, and it did 400 miles to the destination and home.

The culprit was the wiring from the sidestand cutout, which runs behind the right-hand footrest plate and was pinched (I'd had ther plate off a year ago). It fretted through with the vibration, and shorted against the engine.

I've now just removed the switch wiring altogether. It was always a PITA. What surprises me, though, is that no fuse blew.
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Inge K.
Flying Brick Rider


Joined: 30 Apr 2011
Posts: 458
Location: Norway

PostPosted: Thu May 05, 2011 1:34 pm    Post subject: Re: Nicely fried wiring Reply with quote

Siamese Duke wrote:
I've now just removed the switch wiring altogether. It was always a PITA. What surprises me, though, is that no fuse blew.


This circuit goes unfused from the ignition switch to the gasoline pump relay, via the kill switch and sidestand switch.
You`re not the only one with this experience I`ll guess, since BMW change this wiring on the version with Motronic 2.2 from 7/93 on.
After that the sidestand switch breaks the ground circuit on the motronic and starter relay.

Inge K.
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Siamese Duke
Mad Brick Rider


Joined: 26 Sep 2006
Posts: 89

PostPosted: Thu May 05, 2011 2:39 pm    Post subject: Reply with quote

Well, I'm damned. How bloody silly. Thanks for that.
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John Clauss
Flying Brick Rider


Joined: 04 Apr 2003
Posts: 732
Location: Robesonia, PA

PostPosted: Fri May 06, 2011 9:56 am    Post subject: Reply with quote

I had a similar issue with that wire, except mine would blow the fuse for the brake light every time I touched the rear brake. I dug in found the pinched wire, then routed it in a way that it will never happen again. Plus I put some shrink tubing on the wire, that will protect it better than just tape.
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1975 R75/6

It will bring you so close to nausea, it will make you sick! - Big Al
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Inge K.
Flying Brick Rider


Joined: 30 Apr 2011
Posts: 458
Location: Norway

PostPosted: Fri May 06, 2011 11:27 am    Post subject: Reply with quote

John Clauss wrote:
I had a similar issue with that wire, except mine would blow the fuse for the brake light every time I touched the rear brake.


Then it must have been the wiring for brakelight switch, and not the sidestand switch.
But afterall routing for both wirings are similar, and it`s rather tight behind the footrestplate.
It`s seems like some extra attention to those wires whenever the footrestplate is disturbed are needed.

Inge K.
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Ernie-NH
Flying Brick Rider


Joined: 14 Oct 2009
Posts: 982
Location: Bristol, New Hampshire

PostPosted: Fri May 06, 2011 11:47 am    Post subject: Reply with quote

Very Happy Very Happy


Good morning "Duke"...

Nice job on the roadside improv repairs !! Good that you had the tape with you, and as always, great to have a good 'ol Swiss Army knife. Thats the kind of diagnosis and repair that us very old Airhead riders (r100/7 ) have become familiar with. When my entire wire harness fried front to back, I elected to make my own, using my own routing, wire identification, and connectors.... plus I used 'aircraft quality' wire with double insulation. Despite that, I KNOW just how it feels to be on the side of the road, hundreds of miles from home, with a severe problem to confront. True, its all part of the motorcyclists life, but those first few minutes before a plan is mentally formulated can be very frustrating !

Glad your safe, and glad you made it home !

Very best regards.................// Ernie in NH
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