the speedo and tach are not working, but everything else on the cluster is working fine (clock,gas,and temp)... could this be a fuse, wiring issue or what?

amadeo_244

 

yes, it could.

(any of the above).

 

ok which one of the fuses is the speedo?

 

that depends on the car. I'm guessing you have a 240 sedan from your handle, what vintage is it?

actually, I'm not sure there is a fuse in the speedo path, but I'll check the wiring diagrams once I know what year/model.

 

its a 1986 244 DL

 

hmmm. speedo power comes directly from pin 15 of the ignition switch, on a red-black wire, to pin 3 on the speedo. black wire to speedo pin 2 is ground. blue wire to pin 1 is the speedo signal, this comes from the speedo sensor which is in the back of the differential.

no fuses in the speedo/tach circuit I can see. fuse 8 is the courtesy (dome) lighting, clock, and glovebox light, near as I can tell.

the greenbook wiring diagram is pretty confused on the instrument panel. there's a voltage regulator, I believe this may be involved with the speedo and tach, its a 3 pin device screwed onto the back of the instrument panel thats between the circular and half-circular plugs.