My VZ ute blows the drivers headlight globe 2-3 months. Tried buying expensive 'good' globes, turning of lights & only switching on once running to avoid altenator surge, cheap globes & checked all connetions. Still does it. Spoke with auto-elec & had no joy. Any ideas?
If you are getting around 2 to 3 months life out of the globe, it sounds very much like low voltage being supplied to the globe. Due to the way Halogen globes operate (an explanation of which is really outside the scope of this thread), they are quite dependent upon receiving the full voltage (circa 13.8V for an average vehicle electrical system), and their life can be seriously curtailed if they are operated on a voltage that is lower that what is specified for them (at least 12V at a bare minimum).
Accordingly, you may need to do a voltage check directly at the globe terminals, whilst the globe is operating (both high and low beam if that is the globe that is causing the problem). This should show if you have any voltage drop from the headlight 12V+ supply wiring, and/or on the earth side of things.