Lost my headlight only works on high

[Bad On 3]

Hi i have a 99 interstate and the alt.went bad --over charge --blew headlight fuze --replaced it and had one side --now i replaced alt.  blew battery --replaced it  --when i put in new headlight blub it only works on high --wont go down to low --do you think it could be a bad switch --or headlight relay --i dont really know where to start --i hate to pay some shop big bucks to find this --is there anything to look at before i take it to a shop --could a headlight relay cause this ?  ill be thankful for any help !!!!     

[X Ring]

First thing you need to do is get a multimeter and see if you have power for low circuit on that socket.  If not, then go looking upstream from there.

Marty

[Jess from VA]

Make sure the new blub (bulb) low beam filament is not broken first.