My Keyless Entry Module has burned out twice once after I fixed the Speedometer battery circuit on the back of the instrument panel. The connector was reading a little over 12 volts before the Module burned. Afterwards, the connector had no voltage. The speedometer has not worked in many years and appears to be shorted out. I got the car from my grandfather about 7 years ago. My plan is to replace both and hope for the best. Is there a way to check for a bad speedometer servo?