Check the fuses
WHAT ARE YOU DUMB REPALCE YOUR LIGHT BULBS STUPID! Not stupid replaced circuit boards checked fuses ran test light . When headlights are on no brake light or taillights and have all new bulbs stupid. Turn headlights off brake lights work, so figure that out smart man
Do parking and dash lights work? If not, may be fuse most vehicles it is the same circuit
my Dakota did that it may seem weird but it was the flasher relay
GO AND BUY I NEW light bulb !
It is true to say that Halo headlights bulbs can be replaced.
The regulator is in the engine computer not the alternator.
Check the fuse for the headlights. It is probably open.
Sounds like your alternator and battery need to be replaced soon.
The computer only resets when the battery is removed. The alternator just charges the battery, so if the battery is left connected when the alternator is replaced, the computer should not reset.
You probably won't have dash lights either. The problem will probably be at the light switch. If you take out the switch, there will be a burnt wire, and the switch will have to be replaced, along with a pigtail for the burnt wire.
We replaced the alternator on 2 different vehicles. It was around $175 for each.
Inside the alternator