Campervan Fridge Caravan Fridge Question?

Caravan Fridge Question? - campervan fridge

Britain ............ I installed a refrigerator in a mobile trailer .... The fridge is working outside the system .............. 240V 12V cables are not logged in. .......... hot gas is connected, but I can not (light the flame visible through the little window into the fridge )........ My question is what the 12V is connected without to ignite the gas .................. the fridge is a 1990 Caravan RM212 I think .............. . Igniter is not a push-button is red