9 replies to this topic

[iz4dja]

Hi all,
Lately my tdm didn't want to recharge properly the battery so I checked it out by the voltmeter and it was 13,60 volts at 5000 rpm like it shoudn't be.
The right mesure must be up to 14 Volts at 5000 rpm according to the service manual.
In the begining was really odd because it seemed to me not a fault, but it was.
I have discovered a shortcut to Gnd from the turn coils of the stator wich is supposes to be electrically isolated from the ground, from the frame and from the engine, I mean.
Actually the service manual doesn't say anything about isolation from Gnd but you can see it if you have a look on the electrical diagram.
Full of doubts ,and with my battery almost discharged ,I opened the left cover of the engine and as you can see :

stator

It has some illness

and it is shortcutted to the metal frame

my poor bike

this was mi bike's fault at 102.000 Kilometers, fix it up, sorry fix her up, with a rewind one , paid 150 euros against the really expensive new brand one , I heared wich is something like 600 euros .

Hopefly it will help.

Marco

[dicky1]

Hi Marco, that looks pretty bad, any idea what may have caused it, water perhaps getting in?

[emperador]

How did you discover GND shortcut?

[iz4dja]

Hi Marco, that looks pretty bad, any idea what may have caused it, water perhaps getting in?

I Think , it has something with the high temperature and the old age.
In Bologna, my city we had something like 40 degrees few weeks ago when it got broken.
I have a lot of electrically optionals too like extra high beam on the engine crash protectors ,heated grips, HID lights on the low beam and high beam.
I am becareful when using these optionals, never toghether, but could be one reason by.
I have heared others stators got out of order around 140.000 kilometers of running.
It's true that there is a strange moisture , in that hollow where the white cables pass , caused by the water probably but I don't think that's was the reason of the fault.

Bye bye

[iz4dja]

How did you discover GND shortcut?

when I mesured between The single white cables to the ground, you know that grey connector attached to the regulator/rectifier ?
Well , it comes from the or to the stator.

Fortunatly ,I had an other tdm 900 to compare with.
So the working stator must be isolated from the ground.
The service manual doesn't say anything about it but if you know how to read the electrical diagrams, you can understand from it ,because the stator it is not grounded.

The others mesurements were in low ohm (thanks to ICE tester) between 1 and 2 - 1 and 3 pins of that gray connector , according to the service manual they should be 0,18 - 0,28 Ohm at 20°C degrees.

Mine were 0,75 and 0,35 Ohm.

[ChrisG]

Do the HID lights take much more power?

Shouldn't do, they take a fair bit of power for the first few seconds but then settle down to a lot less than a standard bulb. The ballasts should be designed that the initial surge isn't too high so I'd have though it shouldbe similar to a fillament bulb.

[iz4dja]

Shouldn't do, they take a fair bit of power for the first few seconds but then settle down to a lot less than a standard bulb. The ballasts should be designed that the initial surge isn't too high so I'd have though it shouldbe similar to a fillament bulb.

Well, When I mesured it with the ampermeter :

first couple of seconds : 7 - 7,5 amps .(one peak was 7,8 amps) I did 5 attemps to see differences....

then it stabilized at 3,5 Amps for the rest of working.

Mine brand is Lampa from 2005 so I guess that is quite old technology infact I have separeted the ballast from the ignitier.

On the high beam I have some brands from e.-bay with slim brain but still separeted ignitier.

[iz4dja]

typical failure for a stator - short to ground
HID's didn;t affect it

its got a hard time being immersed in hot oil

some are absolutely black after failure

I agree ! That's the life of it : up to hundred thousand kilometers.
Some italian guys in Our forum told that the life of their stator was 120-140 thousand kilometers.
And one of them replace the stator at 146 thousand with one not OEM wich got broken at 167 thousand kilometers , in this case the life of it was only 20 thousand kilometers.

Bye