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Ill send you the link to the service manual or you can search for it on here. Its a pretty big file. About 1 gb in pdf. It will have everything you need in it.
leo99,
I went to ebay and searched acura tl main relay...look for item no
3902 1054 1681. Print it and purchase it from your nearest acura dealer and ask for a service manual copy sheet
to locate it. Your 1999 and my 2000 is the same.