Another Caterham Speedometer Fail

[scannon]

Update:

 

The problem turned out to be a spade type connector that somehow came undone under the dash. It supplied the 12v to the sensor to produce the pulse to the speedometer. I had thought the speedometer supplied that voltage and therefore the problem was with the speedometer. Its been about 9 years since I wired up the speedometer and I had forgotten that I had to provide an external switched 12v to the sensor. I think a passenger's foot must have caught the wire as the connection was tight when I reconnected it.

 

There is quite a rats nest of wires under the cowl on the passenger side resulting from the addition of the Hydra Nemesis ECU, the Hydramist water and ethanol injection brain and an aftermarket electronic cruise control. I had it all tucked up as best I could but several times passengers have caught the toe of their shoe getting in or out of the car.

 

I had decided to order the Speedhut GPS speedometer but spent one more session with the car and found the problem.