I bought foglamp kit from McDonough and would like to use factory wireing all installed except I don't know how to hook up dash switch I think black wire goes to ground but don't know were red and gray wire go to.
You probably have this but just in case: http://cdn.shopify.com/s/files/1/0176/5842/files/00016-47160.pdf?69 Here is also a good thread to read for overview c foglights | Page 6 | PriusChat