on mine they have used the blue/white and scotch locked into a red/white
I have hot start on my P38 only one wire is cut and linked through hot start. There is obviously a power feed and ground to hot start. Can't think why two separate coded wires are joined together. The hot start tells the ECU the engine is cold so the ECU switches on glow plugs. Ok my bad, look for a wire that is Grey/blue that is the feed from ECU temp sensor to ECU. It is that one that is cut a connected to hot start. Not the one i said before. But you maybe best to disconnect hot start and repair the wires. It is screwing something up. You may even get a dash temp gauge back working.
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