If you are using the DDM kit is has cross polarity protection, so if you get it backwards, it just won't turn on. It won't damage anything. I can't speak to the quality of other peoples kits, but the DDM will have no issues.Does it matter if you change + and - ?
I do not know which is which at the moment, but I am afraid to damage the HID bulbs.
I'm not sure what you are asking. Just make sure you have a spot to put the ballast and igniter where you can ZIPTIE it (no two sided tape!) and that your wires will reach. I always mock things up, do a temp install, make sure none of the wires are being pulled tight, etc.Did you measure before connecting everything?
-Jamie M.
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