93 ranger headlight problems

i have a 93 ranger. the right headlight went out about a week ago. when i removed it it was shattered. i put a new one in it and it lasted about 3 days. took it out and it is shattered too. i was very careful not to bump it on anything or touch it prior to installation. i figure it has to be a wiring short causing it to get hot, but where do i start to look for this. any help will be greatly apprieciated.

Water maybe getting in and hitting the bulb.....check the headlight asbl for cracks, holes ect