I have a 1994 mustang gt with major speedometer and odometer problems. Neither the speedometer or the odometer has worked for a while. I pulled the instrunent cluster to check the worm gears many have suggested and found then in tact. I did however find a burnt wire on the back of the instrument panel that led to "battery" right behind the speedometer. I jumped the broken section of this wire and plugged it right back in the car and thought i fixed my problem until the unit immediately started to smoke.... Any ideas on what else i could try? (Fuses are still fine)
Thank You so much for that testing procedure! None of the bulbs in the instrument are burnt out including the larger and smaller bulbs. I will test the speedometer in the way described in the document and post my results.
I have looked all through my transformer collection and i can not seem to find any 9-12V AC adaptors... although i can find plenty of DC adaptors. Any other ideas on how i can get 12v AC?Assuming that the motor behind the speedometer is the source of the problem, I have searched online for "1994 mustang stepper motors" ("-instrument panel","-intrument cluster repair","-intrument guage repair", etc...). Do you know where i can locate the motors i need to replace?
UPDATE: I decided to go to the scrap yard and buy a mustang 1995 instrument cluster. The problem with the unit was something on the speedometer computer or motor. regardless when i switched out the tachometer and speedometer unit of the instrument cluster everything worked fine, after minor calibration