Speed Sensor
- Disconnect sensor wires from amplifier, and connect an ohmmeter between wire connector terminals (Dark Green stripe and Black on "E" models, Dark Green/White stripe and Black on Bronco and "F" models) at sensor end. A reading of about 40 ohms should be obtained.
- A reading of "zero" ohms indicates a shorted coil. A maximum reading indicates an open coil. Replace sensor in either case. If reading is 40 ohms and speedometer operates properly, speed sensor is probably good. A new sensor can be substituted to check for proper operation.