mk1-forum.net

Hi Guy´s...

Hope someone might help a lillte here...

I got the sender ( FTZ2330/00 and the gauge ( FG 6233/05 ).. They should work together, right??..

Can anyone tell me how to test them. They are all on the table in front of me.. The sender seems to works fint ( with the ohmmeter ) But can get the gauge to work, it just moves a little bit????? should it goes to full right away wgen you put 12v on it?

Anyones knows how can I test it together with 12V here

All the best

This might help

http://www.minifinity.com/forum/viewtop ... 22&t=54220

surfblue63 wrote:This might help

http://www.minifinity.com/forum/viewtop ... 22&t=54220

Thanks Surfblue...

But mine dosen´t have a voltage stabilizer.. ist pre late 64...

Problem is now fixet.. its all working..

Great!!

I was not aware that a pre- late 64 would not have the voltage stabilizer. Admittingly I don't have the speedometer in my early 64, and I don't remember the configuration of my 61 and other 64, but I have owned nearly a hundred British cars from late 50's to mid 60's and don't remember seeing one without the stabilizer.

From what I remember , the old units would "average" just about 10V by switching on and off with about a half second to one second frequency, though the frequency would change depending on the battery voltage. This, though slow, is at a faster frequency than the gauges could respond. Therefore the gauges appeared to remain relatively stationary. The newer replacement units just use a "proper" semiconductor voltage stabilizer which gives a constant 10V.

All early minis (up to mid 64) don't have a stabilizer.

The early one works on a different basis to the later ones. The early gauge is a moving iron meter and the sender unit makes up the variable resistor of a wheatstone bridge (Rx in the diagram below) which is a method of calculating the resistance of an unknown resistor, independent of voltage.


Early senders have a nominal resistance range of 3-83 ohms, whereas the later ones are 220(ish)-20 ohms and work in the opposite direction.

Tim