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engine won't turn off

My Lister Petter engine won't turn off: it has a solenoid arrangement, which I can turn off manually but not from the ignition key. I cleaned the solenoid contacts, which did thE trick yesterday but hasn't worked today. Any ideas?

Asked by: Paul Taylor  | 9.22am, Sunday 25 May

WW says:

This suggests that there is either a wiring issue between the key and the solenoid, or that the connections on the back of the key switch are either damaged or shorting. Follow the wiring back from the engine to the keyswitch- and ensure that any connectors (such as multiblock plugs/sockets) are properly made.

Mark Langley  | 10.51AM, Wednesday 28 May

Check that the problem is not mechanical; if the solenoid or the mechanism is sticking and not moving freely, this could be the problem.
You do not say whether the solenoid is energised to allow the fuel to flow and the engine to run, or it energises to shut off the fuel and stop the engine. If the problem is electrical, a simple test with a meter or 12V bulb across the solenoid terminals will indicate whether power is present at the right time; if it is the solenoid is faulty, if not then the problem lies elsewhere.

Rupert Smedley  | 6.38PM, Thursday 29 May

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