You have a 30 amp fuse controlling lighting?
Going by what you say,it looks like you should get someone more competent to do the job.
ps...are you still alive?
B. WATT.
February 2006
your wiring is wrong some where 300w t.h.only use 2-3 amps sounds likes a dead short
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix lighting.