12v Cab battery volts no current

[argoose]

High current wouldn't cause that to happen I'm afraid. A pound to a penny pt'll be a dodgy connection and it'll be fine until it's not just like every intermittent fault . At least you've got the option to start the engine to get the step to retract. Good luck

Many thanks. You are probably correct. After disconnecting spraying and re connecting, step now works.
See what happens after a bumpy drive..

 

[argoose]

Update.. Had a trip to Salisbury over weekend, step still works as it should.
Thoughts are dirty/corroded connection.
Again many thanks for replies