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One for the Electrickery Gurus


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As you may or may not be aware, I have a 300Tdi ES body fitted to my 1991 3.5V8i Discovery. Trouble is the person who fitted the body also remove the engine ECU (this also seemed to control the Aircon as well). Temporarily I have fitted a manual switch to engage the clutch on the compressor.

The reason for doing this is the the normal aircon switch supplies 12v to the engine ECU and when switched on the voltage from the switch drops. This then tells the ECU to supply an earth to the aircon compressor thus engaging the clutch. I have tried using a change over relay but when the voltage drops it is not enough to deactivate the relay. So how can I get this to work ?

What I need is some sort of circuit/switch that reacts when the voltage drop to say 5V.



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