When you say OEM lights, are you talking about the headlight assembly, ballast or bulb?
You should narrow down the problem first.
1. Bulbs. These newer ballast are having problems working with aftermarket bulbs. Always buy quality bulbs such as Osram or Phillips. OR you can swap out the side that works to the other side. Look at the brand on the bulb you have. I would do this first and look at the brand of the bulbs.
Next, assuming you have OEM bulbs.
2. Ballasts brand new are super expensive. Go to HIDplanet, you will find soooo many OEM ballasts. I sold various OEM ballast (matsushita, Denso, etc) on there. Super cheap because its hard to make headlight retrofits with OEM ballast due to shape, connections, etc. Swap the ballast on the side that works to the faulty side, see if this narrows down anything. Bulb doesn't ignite, buy a used ballast.
Go to ebay if you don't want to go through HIDplanet. Do make sure product numbers match your OEM ballast model.
3. If you have aftermarket headlights (usually garbage performance, than again OEM projectors on 370z are weak to being with without modding). Actually I don't think you have aftermarket headlights more than likely as most aftermarket companies don't make HID friendly projectors but if you do than post up in here.
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