Clock goes hyper when engine running

Thank you all for your input - some good suggestions and food for thought. I'll have a look and let you know how I get on.

 

What is the time on the Moon? Anyone know?

 

Auto spell did that. Couldn't be arsed to correct it as I didn't think anyone would notice


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Well, I seem to have solved the problem. I'm still not sure what actually caused it in the first place but I have popped an interference supressor into the wiring to the clock and it's now working fine.

 

Was it just anticipating having to spring forward an hour tonight?