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It’s plastic and all glued together. Looking inside as much as possible, the black wire seems to be connected to the light strip and the red one to a small metal piece inside which makes me think that red is earth right? Will it work for now without an earth and only the black wire connected while I order new lights or wait for a replacement from eBay?
PhilDAS-
some bikes have one wire coming from the bulb and that's it. as the casing earths to the frame and makes the complete circuit.
so yours might do that too. you may find it earths to the threaded part, although its likely a circuit board so may not do that.
but if thats the case you could strip the wire back and sandwich it in between a couple of washers or to the frame.
its just something to try, not necessarily a fix but will get you on the road until the replacement turns up.
Dogtemple
It's simple stuff. Try and prise open the lens and you will probably have that led strip come out with one wire attached.
It will be clear where the other one came from.
Solder that back on or get someone to do it for you.
Reassemble it and wire it up.
If the connections don't match just snip the off and get some universal press fit connections.