I recently purchased a Gentex GENK41A off ebay because it has Homelink. The plug was not compatible with the wiring harness glued in the headliner. A document that came with the mirror said you can splice it. The mirror is a 3 wire setup - Green (ignition), White (Homelink) and Grey. The wiring harness in the headliner is Black, Yellow, Black & Yellow, Purple and Green. I know I can splice the green wires but where would the White wire on the mirror splice to in the harness? The grey wire for the mirror is unused.