Newby to XS400 need advice

Try to buy from individuals that can make a claim about the part working. I don't know what your budget is, but it seems like everything is there on ebay. You need a lot of parts, so just start knocking them off one at a time.

Maybe you'll get lucky; I did see a few complete harnesses on there that looked as though they had all of the electronics still attached.
 
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