Good replacement for ballast/ headlight assembly

We're getting our terminology mixed up here halogen the word halogen has nothing to do in the world of HID headlights bulbs and housings That's a D4S bulb or something similar if you have factory HID headlights in your Prius generation 2 if you have halogen then you have regular filament halogen bulbs that get hot enough to burn your fingers to the point where you might need a skin graft they're very hot regular old timey bulbs You can change your old timey halogen bulbs to fanless LEDs that are extremely bright and whatever color spectrum you want or you have HIDs and the ballast or the bulbs are going bad and you buy the a l l a h i d to LED conversion and follow the instructions to wire for ballast bypass and then you're running off the 12 volt for your new LED bulbs in your factory HID housings and you're not using your ballast or anything else just the shutters for the low and high beam transition and the bulbs you just purchased and that's it so I'm not sure what it is you have or what it is you're trying to do and the fuse business I'm not sure of the one that's not working in the fuse that you move replace that fuse get rid of ballasts bypass them convert to LED and you won't visit this problem the rest of your tour with the car

 

If you're doing the HID conversion on your HID car you're leveling will remain in check if you're putting LEDs in the halogen housings you're going to need to crank down on the adjuster 8 half turns or a tad more and you see your cut off on the garage door in front of you set that at the proper height than you're done You have no automatic adjusting on the halogen Prius

 

The typical problems on gen2 headlights are the melted connectors and cheap halogen bulbs.




Also use Sylvania Basic H4 bulbs NOT high intensity versions that create more heat and burn out quick. $19


Check the ground as well

 

....

 

I stand corrected, change the ballast....

 

Yes you did ....What,? Check for melted connector H 4 3 pin wen lo beam on chk voltage on good lamp . Should have same power on non working side. If so the look at bulb led will out last halogen by like 3 times so generally most cost effective . Whether you want to change them or not.o have 3 cars with these hid and halogen originally .

 

Sometimes they just don't make a good connection. I used to take the light out, put it back in and wiggle it and it would come on. Still do it with my yellow lights in front.

 

Which is why you change the plastic factory connectors for the $7 ceramic connectors. Just find somebody who can read a diagram (optional) and knows how to splice a decent sized power wire.

With your symptoms, assuming they are reported accurately, your relays and grounds have to be good. The headlight housing has nothing to do with the circuit. We will assume you checked the fuses. Unless you have rodent damage to your wires, it is bad connectors at the bulb.