Speedo wiring - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 15 (permalink) Old 04-07-2010, 10:51 PM Thread Starter
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Speedo wiring

anyone know which wire off the stock speedometer will run an aftermarket speedo?

thanks
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post #2 of 15 (permalink) Old 04-08-2010, 07:08 PM
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I would imagine that an aftermarket speedo should use the factory pickup, or it will come with its own. From what I can come up with there are 2 wires from the pick up to the speedo a blue/yellow and white. This is for the 1100. I don't have any wire diagrams for the 950 or 1300. Maybe some one else can help here.

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post #3 of 15 (permalink) Old 04-10-2010, 11:16 AM Thread Starter
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so, it would be the white wire that sends the signal to the speedometer?
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post #4 of 15 (permalink) Old 04-10-2010, 11:33 AM
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actually it would be both as it is an electrical pulse. One wire will act as the positive and the other the negative. The Yamaha speedo operated by a small voltage being generated by the rotor on the drive shaft causing a voltage to be generated in the coil of the pick-up (speed sensor). This voltage will increase as speed increases.

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post #5 of 15 (permalink) Old 04-16-2010, 11:21 AM Thread Starter
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speedo witing

so then one of the wires (red/white) would go to the speedo and the other would go to (switched) power?

my next question would be which one goes where? the shop manual I viewed ar the dealer wasnt as specific as I would have hoped for.
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post #6 of 15 (permalink) Old 04-16-2010, 03:17 PM
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Which Bike do you have the wiring is different with each one?
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post #7 of 15 (permalink) Old 04-16-2010, 08:36 PM
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Volt meter

I wonder if you can't just use a Volt meter. One wire will have a DC voltage probably same as the battery. The might have an AC voltage that Changes with speed. You would need to jack it up and spin the wheel. I guess that might not tell you where they go on the speedometer.

Dave

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post #8 of 15 (permalink) Old 04-16-2010, 08:52 PM
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There should be two wires with DC + the signal from the pickup. One wire will be always hot for the memory to the Trip and one that turns on the display when the key is turned on. It might not be a typical A/C voltage but more of a pulsating D/C. The closer the pulses get together the higher the resultant voltage that drives the speedo. This will also feed a counter that works the odometer.

What kind of bike is it?
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post #9 of 15 (permalink) Old 04-17-2010, 11:29 AM Thread Starter
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99 1100 custom
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post #10 of 15 (permalink) Old 04-17-2010, 07:03 PM
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Black = Gnd
Red/Grn = always hot
Brown = Key on power
White = Speed Limiter
Blu/Yel = Speed Input
Pink = Trip Reset

Don't know what you are lookin to hook it up to but this is a start.
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