R33 Series 2 Electrical Problem?

[obsessed82]

hi guys, im having problems with my left head light, where the fuse keeps blowing, and hence the bulb is off too... so im driving with one head light. its also connected to my boost gauge which will also turn off as well. Once i put a new 15amp fuse in.. it blows again when i start driving.. ive tried and tested everything like disconnectin the boost gauge, checked all wiring in the engine bay to see if there is any surge, and also inside underneath the steering wheel. anyone here know much about electrical problems in these cars that can help me? cos my hands are tied..

cos it seems alike a simple eldctrical problem but i dont know where else to look.

cheers guys