Dometic Hob 9722 electric ignition switch not sparking

[MattStuttard]

Hey folks, I wondered if anyone had any tips on why my hob might not be sparking...

I've chased the voltage as far as I can / I understand...

It comes into the unit at 10.5V (leisure battery is kaput and being swapped when new one arrives - battery reads 12.1V)

Touching the positive input terminal of the switch and the negative terminal that leads out of the unit I get 10.5V

When touching the output terminal from the ignition switch with the negative terminal that leads out of the unit I get 3.5V

Is this drop expected or is the switch knackered somehow, was working fine last week? :/

Any idea otherwise how to remove the ignition switch so I can attempt cleaning it?

 

[MattStuttard]

Thanks in advance
(can't edit post for some reason)