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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Digital Speedo TTR OE
Post Info TOPIC: Digital Speedo TTR OE
een705


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Digital Speedo TTR OE
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I am waiting for a multi meter to arrive soon but this is my problem there is no display at the moment. I can take the headlight cowl off and pull the connection that connects to the speedo and plug it back in and it works but when I put the headlight cover back on and turn the ignition off and back on and it will not work. I disconnect it and connect the sppedo and it it comes back on and I can turn ignition off and on it still works. I then put the headlight cover on and turn ignition off and nothing. When the digits appear and I turn the rear wheel the kph goes up. What do I need to do? Thanks for reading and I hope it makes sense.



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TTRfan


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 Hi Ian

Yamaha hasn't published the wiring connection information for the digital speedo to the best of my knowledge but a previous owner did some investigation and this is how he thought it all connected up:

Red + 12v
Brown + 12v
Yellow +5v into the speedo from the speed sensor at the sprocket. This is the pulse wire, the pulse is sent as +5v, -5v, +5v, -5v etc.
Blue +5v out to the speed sensor.
Black/Yellow 0v (Negative) out to the speed sensor.
Black 0v (Negative)
Connecting +12v to the Red wire lights the speedo up but with no LCD display.
Connecting +12v to the Red & Brown lights it up & powers the LCD display.

It would appear that you have a faulty connection to either the red or brown wires into the speedo (or both) as taking the headlight off and replacing it should have no effect on the speedo's operation.

If you can't find the faulty connection, my suggestion is that you bypass the connections in the loom and take a feed from the fused side of the battery and test connecting it to the red wire into the speedo and then the brown with the headlight fitted. This would be at your own risk but should identify whether there is a fault in the speedo or the wiring.

Brian 



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een705


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An update on speedo.. I havnt taken a live feed to the speed yet, when I checked the voltages on the red and brown they both showed 12v and I thought I had sorted it when to check later in the day no power to speedo and all I need to do to get it working is disconnect and reconnect connection and its fine. Should I now try 12v to speedo as you suggested?

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TTRfan


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I would wink



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een705


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I dont know if this is related but the battery is going flat so I bought a new battery and that seems to be doing the same. I have tried to do a drain check using a multimeter. I have disconnected the battery negative and set volvt meter to amps DC but then connect to positive on battery and the earth lead but get nothing. What am I doing wrong and have to add im rubbish at electrics.

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ttboof


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Haven't seen the digital speed here but a couple of checks 

Charge voltage with Meter on DC volts should go up-to around 13.5 when the revs come up for a while 

 

To check for drain .Set to dc amps but might have ed to select a lower range like Milliamps  take one lead off the battery and hook the meter in series with the lead and battery should read any draw 

Note if you have exceeded the current rating on the meter at any time you may have blown the fuse in the meter 

 

As an auto elect a first check for a draw is disconnect one battery lead set the Meter on DC  volts then come to in series between the battery and and the lead if it reads 12v or more it's probably worth checking for current draw. If lower than 12v probably OK as there is a higher resistance than The meter so going to be a small draw (OK) 



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ttboof


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Somewhere on the forum there is a bit about dome bikes have had the speedo feed changed so it can be disconnected while the bike is parked to avoid a discharged battery 



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TTRfan


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ttboof wrote:

Somewhere on the forum there is a bit about dome bikes have had the speedo feed changed so it can be disconnected while the bike is parked to avoid a discharged battery 

I recall my "shopping" TTR project bike having problems with the battery going flat when not being used for several days.

I am pretty sure it was the digital speedo causing the problem as it isn't completely switched off with the ignition.

I put a simple block connector in the live feed and just disconnected it after a run. Problem solved and the battery stayed up! 



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een705


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That sounds like a plan will have a look for thread thanks guys


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TTRfan


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To save you some time searching Ian, here it is https://ttr250.activeboard.com/t63784035/charging-problem-battery-drain/  biggrin



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een705


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Thanks for looking ttrfan certainly makes it easier, I am waiting for fuses for my multimeter to do a few checks on reg/rec and connectors for taking a live to the left side of the digital speedo

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