An R+D Thread - Different instruments.

DEcosse said:

I received a sub-harness from @Rocket Scientist along with a 'failed' set of Original Instruments to take a look to see if there was anything I could find:

Original analysis didn't show anything obvious on the board and without a schematic I was unable to do much real 'active' analysis;

However when I pulled out the harness to create the diagrams above, I did see this .............



^That is the one that mates to the main harness - NOT PRETTY!!
(on the mating side, the terminals looked clean however - interestingly there was evidence of dielectric grease on the mating side, but not the wire side)

I'm not sure if that had any bearing on the failure mode - I did not notice it when testing out the module.
I suspect not because I know instrument replacement has resolved this issue (and presumably the original sub-harness was re-used)
Whether or not it contributed to the instrument hard-failure remains open however ............

I will try to clean it up and re-test the module I have to see if it makes difference (again, suspect it won't - my power connections were clipped directly to the wires via positaps )

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DEcosse said:

I believe it is this one that mates to the one on the Main Harness:


- see page 5-8




Note that the image in the link does not reflect the actual part - see the product drawing (above) for confirmation

The Plug (Female Terminals) is 174047-2 (On the Main Harness) - on Left of drawing above.
The Cap (Male Terminals) is 175652-2 (on Speedo Sub-Harness) - on right of drawing above

Male Terminal Cap:



In US available at Mouser -

(note that you also needs the terminals, available separately)


In Europe from RS - https://uk.rs-online.com/web/p/pcb-connector-housings/5306319/


Here are some Interconnect Diagrams I created:





(note interestingly that although there is a wire in the Main Harness Connector for the Illumination, it is unused on the Speedo Sub-Harness that I have on-hand)

It is VERY IMPORTANT to note that the OEM speedo put OUT a switched 12V on Pin 18 (B/Y) which is REQUIRED to drive the speed Sender - when installing an after-market Speedo Cluster this B/Y MUST be connected to a switched 12V source (i.e. connect it to Ignition Power since your after-market gauge will not have this provision)

See also these threads for more on the subject

Potential Replacement for failed instruments on Classics

Instrument Replacement

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Mittzy said:

... Can i assume this dash upgrade wont work on a Roadster????

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DEcosse said:

Assumption correct Tony - the Roadster gauges are CANBUS so many of the signals into it (incl the speed and rpm) are digitally encoded.

I have not tried the Roadster but on other Triumph Keihin ECU CANBUS models of that generation, the bike will not start without the gauges being connected.
Can someone perhaps test/validate that?
(If the bike WILL start without the gauges being connected, it would still be possible to connect after-market non-CANBUS gauges, but wiring would be different (and not everything available at the Main Harness Instrument Connector Interface)

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WyldCFH said:

If you can point me to the connector, I can test this weekend. I need to remove the bars and upper yoke to reroute front brake line, a couple minutes to test this won't hurt me any. Assuming the wife gives me time away from packing the house to work on the bike that is.

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Ishrub said:

You moving again? Didn't you just move to Florida. I certainly do not envy you!

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Ishrub said:

You moving again? Didn't you just move to Florida. I certainly do not envy you!

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WyldCFH said:

Yeah, less than a year in Florida. Staying in South Florida, Miami/Ft Lauderdale, just a different suburb.

We are restructuring my IT department this year, so I have to stick around for another year while things stabilize. Next year, probably moving to the west coast, Portland/Seattle area, or Denver. Hopefully that is the last move. Packing a 3000sqft house is not something you consider lightly lol

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DEcosse said:

Assumption correct Tony - the Roadster gauges are CANBUS so many of the signals into it (incl the speed and rpm) are digitally encoded.

I have not tried the Roadster but on other Triumph Keihin ECU CANBUS models of that generation, the bike will not start without the gauges being connected.
Can someone perhaps test/validate that?
(If the bike WILL start without the gauges being connected, it would still be possible to connect after-market non-CANBUS gauges, but wiring would be different (and not everything available at the Main Harness Instrument Connector Interface)

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DEcosse said:

(and not everything available at the Main Harness Instrument Connector Interface)

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