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I might be wrong but the first thing I would be checking is when its working with a new bulb does it go brighter when you rev your engine? If it does (it might not always do that) I would check for a bad earth on the headlight or where it is grounded to the body. That is the most simple thing to check for but it could be a fault in other places too, (alternator, switches etc.)and unless you are a good electrician I would sugest you take it to an auto spark and let him/her look into it for you. Sorry I cant be any more help than that.
If a bulb blows white the gas mix in the globe is incorrect and you probably got hold of a bad batch of globes from your supplier. Try buying your bulbs from another source and see if that works out better.
If there is power there, then it has to be the bulbs. The trouble that most people have is, they don't see how both bulbs could burn out at once... and they're right. They don't. But you see vehicles with one headlight all the time. They don't know it unless you tell them or they happen to see it themselves. Then the second light burns out, and they think it's a major catastrophe, when in fact, it's just bulbs. The high beam still works because the bulb is double filament. The only other thing it can be is the dimmer switch, and since you switched it to high, it appears to be working. However, if it's not bulbs, it still could be the switch.
If you are handling the bulbs with your bare hands that is why your bulbs keep blowing out. use a washcloth to put the bulb in or rubber gloves, anything that will keep your hands from touching the bulb.
replace the headlight bulbs. Usually when the bulbs blow out the low beam blows out first, but the high beams still work.
If you want and need both low and high beams to work then replace the headlight bulbs with brand new ones and I garauntee that both low and high beams will work