Help --Sport Tac Fog lamps come on then the sun goes down!!! Even when vehicle off

Asked by Mar 31, 2008 at 10:13 PM about the 2003 Ford Explorer Sport Trac

Question type: Maintenance & Repair

I have a 2003 Sport Trac XLT with Auto-ON head lamps. The on-off for the fog lights is a separate switch on the dash near the radio. Normally, the fog lamps will only come on with the low beams. They are supposed to turn on automatically if they are switched on and the main headlamp switch is in the auto setting and the low beams are on. They will also come on manually if the main headlamp switch is turned "on"  and the fog lamp switch is "on" and the low beams are on. Normally the little light on the fog lamp switch glows only when the fog lamps are on.
  Here's the problem: when the sun goes down the fog lamps turn on---and kills the battery. The headlights do not come on with the fog lamps. This happens when the vehicle is turned off, the main headlamp switch can be on auto or manual, it doesn't seem to matter. Interestingly, the fog lamp switch glows "on" all the time. Turning the fog lamps on or off doesn't matter, the on/off indicator of the fog lamp switch stays glowing.
  Are there any Ford mechanics, engineers or Sport Trac experts that can shed some light on this problem?

3 Answers

6,495

I would pull the fuse until you have a chance to have it looked at, as this is not a simple issue, it could be the switch, relay, sensor, module. I would take it in and get it looked at.

1 out of 1 people think this is helpful.

sounds like a sensor problem

Thanks casper and papa for your suggestions. I bought a switch today--that was not it. I think I'll buy a relay tomorrow. Anyone know where the relay is located? If that does not work guess I'll have to bite the bullet and let the dealer handle it. In the meantime, the lights are disconnected to save killing the batter every night.

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