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Do you know what a wiring diagram is for ? How to use a DVOM - digital volt ohmeter to test electrical circuit's ? None of the headlamps work ? hi or lo beams ? Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year , make , model an engine size. Under system click on lighting , then under subsystem click on headlamps . Click the search button then the blue link . Looking at the diagram i see fuse's light switch , multifuction switch , relay's - hi & lo an the headlamp assembly's .
Now watch this video Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
check the wire on the the switch by removing it normally two or three screws hold it in place,if wires are tight remove them and replace the switch unless you can adjust the plunger
there is a recall on them i had the same issue it is caused by the wires being crushed when the trunk colses(im an ex ford mechanic, and ex owner of a focus)
a loose or damaged wire is causing a short circuit!
you ned to get it tested & rectified by a auto electrician ASAP!
as wiring gets very hot & can destroy your vehicle! {catch fire]
Sounds like a short circuit here ? You will need to locate the short circuit . Most probable is the tail lamps and their connections , then number plate lights , then any hinged wiring going from body to a door or trunk (ie No plate illum lights) area . Sometimes the dash dimmer can be a problem . Good luck
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