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1999 F-250 Superduty Marker Lights wont shut off hellllppppppp

Discussion in 'Ford Trucks' started by diesellandscape, Nov 29, 2010.

  1. diesellandscape

    diesellandscape Member
    Messages: 79

    1999 F-250 SD
    Reg Cab
    8ft Bed
    4x4 v-10

    I went back to the shop tonight, turned all the lights off and the marker lights stayed on!
    Its not the switch... I pulled that 1st and un plugged it.... Still on

    I'll prob dig into it in a day or 2...
    I'm hoping its just a bad reley stuck open or something dumb.

    any ideas?
  2. 350 STROKER

    350 STROKER Member
    Messages: 55

    i have some of the same kind of weird stuff with my 01 f-350 but with mine it the reverse lights. i was under truck the other day and saw that ground strap was missing under the cab on the pass.. please post up if you find the problem.. thanks
  3. damian

    damian Senior Member
    Messages: 330

    behind the lower dash fuse panel is a relay box, like a gem module.it imay be wet.we see these on trucks that have had windshields replaced and are leaking,remove this module and try to dry and wd 40 it.this module will also leave your radio on and a few other things good luck.