Gauge Problem.

[warp9.9]

So I'm just a dumb guy trying to interpret schematics & other resources to suggest causes (no Rocket to look at)
And I look at schematic & see one thing; but looking at hardware I see something else;
not shown on schematic, there is a sub harness from the main instrument connector to the two individual connectors for each instrument
Interesting that there is different part number for the sub-harness that kicked in at serial 322157 which might be with the break-out connector.

Odo Trip Resets
Tach does not sweep

If problems are on BOTH instruments. you have to look to common factor - that again points to the power source i.e. The Purple wire or perhaps the Ignition Power - Green/Red* or illum Power Red/Blue
It also suggests unlikely to be an instrument failure you could reasonably deduce?

*Note there are two Green/Red wires with completely different functions - just 'Brilliant' Triumph.
(that has been the same regarding those colour designations for ignition power and left turn on just about every Triumph in the Hinckley era)

Also inspect the two plugs into each individual instrument itself; also, there has to be splices somewhere on that sub-harness since there are common wires to each gauge.

One other interesting note is the reference in the update statement that says "poor connection AND ELECTRICAL INTERFERENCE"

Your not dumb as you just made me catch on that the harnesses modifications are on two different harnesses which I over looked. The ignition harness and the gauge harness.
Thanks now to go look at one of my bikes that is apart in dry dock now

 

[STRIPES]

I was plagued for month with the gauge issue. Mugzy my guru said there is a sub processor common to both gauges. He said it looked like it lived inside one of them. I replaced the gauges and all is well now.

 

[Lenny]

That will be my last option,(new gauge) Rather than keep on going crazy i will book an appointment at the dealer and let them sort it out.

 

[Jabo75]

I was plagued for month with the gauge issue. Mugzy my guru said there is a sub processor common to both gauges. He said it looked like it lived inside one of them. I replaced the gauges and all is well now.

Any insight into which gauge is the bad one? They certainly aren't cheap and I would hate to unnecessarily replace one that is working fine.
If I had to pick one, I would say it's the Speedo.

 

[Jabo75]

That will be my last option,(new gauge) Rather than keep on going crazy i will book an appointment at the dealer and let them sort it out.

Lenny, I have an appointment with my dealer on Thursday morning (provided I make it back in town by then from work). I will keep you posted. Please do the same.

 

[Rocket Scientist]

That will be my last option,(new gauge) Rather than keep on going crazy i will book an appointment at the dealer and let them sort it out.

Any resolve on this ? Mine started doing the same thing.

 

[Lenny]

I took the bike to the dealer(Gold Coast) 2 weeks ago, i called them Today and they havent even looked at the bike Yet.

So short answer dunno what its wrong with the bike yet.

 

[jespo]

Any insight into which gauge is the bad one? They certainly aren't cheap and I would hate to unnecessarily replace one that is working fine.
If I had to pick one, I would say it's the Speedo.

I am having the same issue with my 05, 26,000 miles.
Symptoms:

• Warning lights will not come on (nor will tach sweep), UNLESS, I more the big while in gear forward or backward, then the tach sweeps and the warning lights come on.
• Odometer was dim, although over the course of 3 weeks, it seems to have gotten brighter (more contrast).
• Trip odometers still reset every time I shut the bike off.
• Occasionally, the bike won't start (starter won't engage) on the first try. I have to shut it off turn it back on.
• The speedo never sweeps before starting.

Steps I have taken:

• Prior owner has already replaced the ignition switch.
• Popped the tank and disconnected, cleaned and dielectric greased every connector under the tank.
• Checked the ECU plugs for any water leakage.
• Tested fuses.
• Disconnected the battery (to reset the ECU).
• Replaced the speed sensor (once I noticed that rocking the bike caused the warning lights and tack sweep to happen, it seemed like a reasonable next step). Cost was $160.

I have a Tune ECU cable on order from Amazon, although I am planning on taking it to the dealer on Thursday. I will update when I have more information.

I had the same exact symptoms described here EXCEPT for the ‘occasional not starting’ issue and is unrelated to the other symptoms described here.
After lots of troubleshooting, the root cause was/is a bad speedometer.
I was able to confirm this by swapping my working speedometer from my other Rocket classic.
Wanted to share this info for the next person that hits this issue.

 

[Jabo75]

I had the same exact symptoms described here EXCEPT for the ‘occasional not starting’ issue and is unrelated to the other symptoms described here.
After lots of troubleshooting, the root cause was/is a bad speedometer.
I was able to confirm this by swapping my working speedometer from my other Rocket classic.
Wanted to share this info for the next person that hits this issue.

Will undoubtedly be helpful to people with failed speedos out there.
Also worth mentioning, when I brought the bike to the dealer to diagnose, they said I needed both a tach and a speedo. They were each about 500-600 bucks. I told them to only order the speedo. As it turned out the replaced speedo fixed the problem. This was about 7 years ago.
Also, if you replace the speedo on a R3 (don't know about the new models), the new unit cannot be programmed with the existing mileage, so for registration purposes keep a record of your mileage at the time of the swap.