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blackfly
04-18-2003, 05:29 PM
On my '96 K-RS (like most previous years), BMW uses MotoMeter guages for fuel level and coolant temp. They look like VDO Cockpit guages, except they have "MotoMeter" near the bottom of the face.

Can anyone tell me what the voltage/impedance is on these guages so that I can replace them with the appropriate VDO models? I cannot seem to find the ratings for either guage. There probably is a way to check by using a multimeter - I just do not know the correct procedure.

Many thanks.

fred burgess
Brunswick, ME

blackfly
04-18-2003, 10:45 PM
To be clear: What I am looking for is replacement VDO gauges that are compatible with the sending units of the K1100RS. Sorry if you were confused.

fb

kioolt
04-20-2003, 02:34 PM
The fuel level sender resistance should be easy enough to measure. Remove the fuel cap to gain access to the fuel level float. It would be best to do this with an almost empty tank. Unplug the fuel level sender from the wire harness and hook an ohmmeter up to the leads. I believe that it can be accessed at the rear of the tank. You may have to raise the rear of the tank. Raise the float to its highest (full) position and read the meter. Lower the float to its lowest (empty) position and read the meter. That should give you an idea if VDO makes a replacement gauge that will work.

deilenberger
04-22-2003, 02:23 PM
Originally posted by kioolt
The fuel level sender resistance should be easy enough to measure. Remove the fuel cap to gain access to the fuel level float. It would be best to do this with an almost empty tank. Unplug the fuel level sender from the wire harness and hook an ohmmeter up to the leads. I believe that it can be accessed at the rear of the tank. You may have to raise the rear of the tank. Raise the float to its highest (full) position and read the meter. Lower the float to its lowest (empty) position and read the meter. That should give you an idea if VDO makes a replacement gauge that will work.

Good thought - and also the temperture sensor should be fairly easy to measure. You can measure it at the gauge plug, and if you measure it at 20C (room temp - ~71F) and then when the fan comes on (~195F) you'll have values to start with.

Is there a particular reason not to just order the BMW gauges?

blackfly
04-22-2003, 06:25 PM
:cool:

Well, I have immediate access to the VDO line and there are two possible configurations for the temp gauge. I think the fuel gauge has three possible. I was sort of hoping someone out there would have the impedance/ohm rating from a technical source.

Perhaps not...

fb

kioolt
05-04-2003, 12:42 PM
Try this for you coolant temperature gauge.

http://www.ibmwr.org/ktech/temp-gage-debug.shtml

blackfly
05-04-2003, 01:14 PM
Revisit.

I tested the original sensor and decidied to replace it. Although the sensor was not in spec, that was not the problem. There is a damping mechanism inside that is defective.

The (OEM) BMW gauge retails for US$96.00. So, at US$30, the VDO Professional Cockpit replacement is the logical choice.

Although I do not know absolutely, it would appear that Motometer is the 'division' that BMW AG established to source instrumentation for all applications.

The Cockpit gauge is so in fit, finish and design, that VDO must be the manufacturer.

fwiw.

fred:brow