08 mercury mariner ? reverse lamps ?
Reverse lamps relay could be the problem . located in the under hood fuse / relay box. Fuse box diagram here
http://www.bbbind.com/free-tsb/ enter vehicle info. year , make , model an engine . Under system click on electrical distribution , then under subsystem click on fuse panel . Click the search button ,then the blue link. The first diagram is the under hood fuse/relay box . Upper right side , along side fuel pump relay . Try replacing the relay .
×