What would make your speedometer stop and abs light and brake light come on in 1998 dodge ram truck ? – Cars & VehiclesReport
On the top of the differential there is a speed switch which . you can check the switch by unplugging it and put an ohm meter across the prongs on the switch if it reads infinity ( open) it is bad ( a good switch will read about 1.8 K ohms of resistance) and will cause the abs and brake lights on the dash to stay on it will also will cause the speedometer not to read below about 20 MPH. the switch is a dealer item – cost about 40 dollars. the switch is easy to change and take about 10 minutes.
You might want to take a look at the speed switch – its a pickup switch used to monitor your speed