Dash lights on after key removed

Hobsini

New Member
The dash lights on our T6 camper (conversion) stay on when the key is removed. The van won’t start either and had assumed it was a flat battery but don’t understand why the dash lights would stay on with the key removed. Any advice as this makes me wonder whether we have a different issue?

Also, what’s the best way to check and charge the battery? Have read about not connecting to negative terminal (for example).
 
Either an issue with the ignition switch or possibly the converter has created a connection between the leisure battery and the ignition supply.
 
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