Same here. Got my 77 K-10 and have a chance at a rust free 1985 C-10 with title for $200.00. I know when my 76 body went on my 79 frame, it all worked with no problem. Could it be the same for the 85... then again, it may be easier to just take the wiring from the 85 since the whole body is coming off of both trucks anyway.