Aftermarket lights are pretty dodgy. The wiring in mine was just pushed up into the connections - no solder at all! The braklights had a dodgy earth, which made my digi dash turn off whnever I put the brakes on. So - check earth and the connections of the wires in the clips that the bulbs sit in...

gimmie a shout mate. what bulbs ya needing.is it a corsa b or c

they use nova bulbs by sound of it, very common

will use same fuse as old stop light or tail light, not seen how they are wired up tho?

ever since fitting these fookers ive had beef with em the bulbs have been changed countless times and i no that there the wrong ones -halfords dont even do the double filerment bulbs for em?

problem now is with the break lights they dont work ?
fullbeam and sidelights work fine but theres no light for the breaks- i fitted the bulbs about a month ago they worked fine -now they dont and they are not fused- i was told also that there may be a bad earth on the lights??

is it in the douuble fillerment bulb holder or what? someone help man