Having some electrical issues with my dashboard on 04 f4i. The main problem is that it only acts up in excess of 100 mph. How do you diagnose a high speed elec. problem when the bike is at a stand still in the garage?

 

Dammit, Steve! Coffee on my computer again!

But yeah, dyno I guess....
Strange issue.

 

since we do not know what the electrical issue you have is, it is hard to tell you what to do. If you take your fairings off, and turn your bike on and just move your wires that go with the issue.

 

I'm thinking more along the lines of white coated wing walker boffin...... shoes screwed to the front mudguard, restraint cables and harness..... get her up to speed whilst peering round your personal dashboard tekkie as he goes through a tick list trouble shooting procedure, ..... clip board and all........ he he.
Alternatively just get it up to speed on the centre stand making damned sure the back wheel can't touch the ground. Better still take the chain off and then go for it. Sometimes thinking out loud is a good thing. Who needs a rolling road when you don't actually have to roll?
What's the problem anyway? When you say 'acting up' is this implying that it keeps forgetting its lines or has it just become too arrogant to live with? It's quite a common problem amongst die hard thespians I believe.
I can just hear it now......... "darling, if he thinks he can carry on thrusting my needle into his red zone he's got another thing so very, very coming"

 

Think Omniate (not sure of the spelling) rigged a way to simulate the bike moving to the speed sensor. He used it to roll the mileage forward on the F4i gauges he used in his gauge conversion.

Not sure if its capable of simulating 100 mph.

 

thanks all, good idea with removing the chain, just really hate to run the engine that hard without a load on it. guess i have no choie if i'm gonna find the problem.

 

I think I'm with Steve... Dyno seems the most reasonable way to go. You'll have it under load and as close to real riding conditions as possible. Seems, though, you may have something loose that shakes only under enough stress, which you may not be able to capture on a dyno or even stationary position. I think I'd probably start by going through the harness and related plugs/wiring looking for something that might be loose enough to rattle at 100 mph and see if you don't have one of those "aha!" finds by stumbling across a frayed wire or poorly connected plug.

 

I agree with removing the fairings and looking at the wiring for pinched/bare wires, etc. I do a lot of electrical troubleshooting on injection molds, and have found over the years that while it is not always possible to replicate a problem on the workbench even after witnessing it in production only minutes prior, with some thorough detective work, an electrical problem always reveals itself.