1999 Ford Taurus STRANGE ELECTRICAL LIGHT PROBLEM!

Are you by chance talking about the day time running lights that come on when you turn the key. If so change the daytime running light module it is mounted in front of the driver side tire up in the wheel well.(NOS) are your park light bulbs good even know the blinkers are ok thoes bulbs have two fiaments one set for park light and one set for turn also check you grounds to the sockets

Replace your head light switch (NOS)

Does your repair manual give you any wiring diagrams to look at. You need to find the color coded wire that runs the park lights at the switch. Take a test light probe that wire and turn the switch on if it lights there, that is good. Then you need to go to the outside under the hood find that same wire again and probe with a test light with the switch on if it lights there, then thats good. You got to keep doing this till you find where the power loss is. Just cause they work with the remote don't mean nothing cause there on a different circuit because of the anti theft system. No one said this would be easy. Just take your time and you will find it wiring can be a real pain especialy in a ford. I will try to work on this with you as much as I can. Just have patience. I have a mini van in the shop i'am working on right now that a mouse got into and chewed up a bunch of wires under the dash so I have the whole das settint in the shop floor because parts of the AC don't work and parts of the heater don't work and it is all electronic.I'am an auto tech I work on stuff 8 hours a day 5 days a week and it don't come easy at times. So your just going to have to find where the power was lost. (NOS) yes there are relays but not for the parklights just the headlights because they draw more power than the parklights.

At the switch look for the brown wire. Turn the switch on and test light this wire if the light lights it is good if it don't there is a problem in the plug that plugs onto the switch. But the key to your whole problem is in that brown wire. I looked this up in my books at work hope that helped you better. (NOS) 8)