Quote:
Originally Posted by Boydskyking
its a 1980 SC and what do I look for when I connect a meter to the wire that comes from the sensor is it ohms or dc or ac or what
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The Speedometer is fed +12 Volts DC from the red/black wire. The 12 Volts exits the speedometer on terminal 31b. 31b is a Brown/Red wire that runs through the tunnel and connects to the green wire from the sensor in the rear tunnel access hole. The sensor opens and closes a connection to ground. So the speedometer is seeing a pulsing 12volt signal. Verify that your connections to the speedometer match the wiring diagrams and verify that the Brown/Red wire in the rear tunnel access is connected to the green wire going to the sensor.