I have a problem with my 99' M600 the speedo is reading way out ie. when i'm doing 30mph it reads 20mph, however it does not read just 10mph under at some points it reads 50mph when i'm doing 70mph, it's cable driven.
Any suggestions??
Was this a sudden event?
Well it was working one day and now it doesn't so i suppose so ....
have you detached the cable and checked to see if it's broken?
Is the odometer functioning properly?
Yeah checked the cable it seems fine no cuts or tears etc, would it be the speedometer?
Have you tried turning it off and then turning it on again?
Yes?
Well, then, I'm afraid it's beyond my level of expertise.
Quote from: richard_22 on August 27, 2012, 11:37:35 AM
Yeah checked the cable it seems fine no cuts or tears etc, would it be the speedometer?
Did you detach the cable? And external inspection won't tell you anything. There's a flexible drive shaft inside it.
Yeah I've pulled the cable out, cleaned it up and put it back in... No difference
If the odometer is working correctly the cable is good and the problem is in the head.
Ok what could go wrong in the head? do you mean in the wheel?
No. If the odometer is working correctly it means everything is good up to the speedometer the problem is in the speedometer.
Ok yeah that makes sense, opening a can of worms but what could be wrong with the head??
It's busticated.
Quote from: Peggy on August 27, 2012, 03:52:46 PM
It's busticated.
I hate to agree with Peggy, but, other than a loose needle you are pretty much out of luck. You can try Googleing for someone who repairs speedometers in your area, Fleabay for a used unit or you could go for something like this http://www.spieglerusa.com/gauges-instruments.html (http://www.spieglerusa.com/gauges-instruments.html) and gain a tach or something more modern like something from these folks http://www.koso.com.tw/ (http://www.koso.com.tw/)
check to see that the speedo cable (flexible shaft) is seated properly in the speedo drive attached to the left side of your front wheel. Unscrew it and pull it away a little from the bottom of your gauge and spin the front wheel to see if that inner flexy cable spins/rotates. If so, you at least know you are good to that point and there is definately something wrong with either your speedometer or the base where you seat the speedo cable into.
If it doesnt spin and that flexy shaft is in one piece, then something wrong at the wheel.