The following file contains detail installation instruction for Ford Brake Control Wiring Adapters. This apply for Bronco – full size (94-96), Econoline Van – full size (92-09), Excursion (00-05), Expedition (97-08), Explorer w/Factory Tow Package (02-08), F-150 & F-250 Light Duty (97-03), F-150 Heritage (old style, 2004) F-150/250/350 (94-96), F-250/350 Heavy Duty (1997), F-250/350 Heavy Duty (99-04), Ford F-150 New Body Style (04-08), and Windstar w/Factory Tow Package (95-03).
Here is a quotation from the Ford Brake Control Wiring Adapters manual:
"Locate the vehicle’s electric brake control harness. The harness will be located under the dash near the center console on most vehicles. The harness for the Ford Full Size Van is located underneath and left of the steering column. There wil be a 6-pin connector that mates with the one on the adapter at the and of the harness. Verify that there is battery power supplied to the connector by carefully probing the connector with a test light."
Get detail the installation instruction here – pdf file download (source: www.bestinauto.com)