'Spare' cable for Vanette gg7000 oven!

[wandering snail]

Hi. Trying to connect up a second hand Vanette oven. Hob's done with no problems but the oven/grill has three transparent white cables to connect. So, one has gone to the grill igniter, one has gone to the oven igniter but where to put the third??

Searching through old posts on this forum confirms what we had already found that manuals for this oven are like hen's teeth so hoping someone on here might have the answer. 

Many thanks.

[Jess--]

Oven light?

 

[Alan de Enfield]

Earth / Negative ?

[wandering snail]

Thanks for your thoughts. It was for a cut out switch on the back of the grill door.