Re: 89 200TQ Speedo Sender

[tm2@earthlink.net]

P-O Selander (EUS) wrote:
> 
> > You ask...
> > >Is there anyway to test this sender out of the car.
> >
> Me says:
> Go to any speedometer shop. They can test it in a bench. Probably produces a
> square wave signal (mine in 89 100E Auto did not). Shop verified harness and
> and pointed to the sender. I had however verified the "famous" solder prior
> to that. $100 but well worth the hazzle of finding the root of the problem.
> My problem was a brand new sender from Carlsen. Replaced under warranty.
> 
> P-O Selander, Bellevue, WA
> 89 100E
> 91 300ZXTT

P-O

The speedo sender is a magnetic reed type.  It closes and opens the
circuit  when wheel rotates.  I ran a magnet over the end of the sender
with a ohm meter attached to the two pins.  I did not see closing of the
circuit.  I pulled the top off the sender and there was a coiled wire
with a reed switch from one of the pins.  It was about 3" long and
looped back to the other pin.  At the bottom of the loop it was broken. 
I soldered the broken end together and put the sender back together.  I
tested it with a magnet again and the circuit closed each time I passed
a magnet over it.  Hopefully my speedo will work now.
  

Pat Korach
Kirkland, WA