1990 Ram B150 odometer
#1
#2
RE: 1990 Ram B150 odometer
The plastic odometer gear inside the speedo unit probably stripped a tooth or two. Since both the odo and speedo are controlled by the same sensor (or cable) the problem is limited internally to the speedo unit itself. Getting one from a junkyard and swapping it out is your best bet. Keep in mind that you will need the mileage from both units and keep a record of them for when you need to sell the vehicle.
#3
RE: 1990 Ram B150 odometer
I removed the unit and was able to get the odometer to change simply by rotating the gear. I could see the gear on the servo motor rotating so I don't have a stripped gear. I believe it might be that the servo motor isn't getting any power. Does anyone have any knowledge on the electrical circuitry of the unit?
#4
Trace the wire coming out of back of cluster( my 92 was purple).I had the same problem with my 92. I did the salvage yard swap( paid extra for return if no good- it was no good) it had same problem. I did a little research and found that the dodge Odometer has a 16 tooth and a 26 tooth gear deep in cluster.You can't see the little 16 tooth gear and that's the first to go. I researched farther and found both online in a kit for$ 27.60 delivered to front door.locally wanted$ 28.00 just for the tiny 16 tooth gear... shop around