Im thinking it some how much be the head light switch shorted ????? Thinking doesn't fix electrical problems ! Learning how too does. Viewing electrical diagrams , testing the electrical circuit's with a DVOM - digital volt ohm meter , reading in a factory service repair manual how the affected circuit is suppose to work an using factory pin point testing procedures . That is what fixes electrical problems . Bet you replace the switch an it doesn't fix it . Without testing i could only guess as to what the problem could be . But an educated guess i would think a ground problem .I bet if you looked at a wiring diagram all these have same ground point near the back of the vehicle . Electrical voltage is back feeding through the circuit trying to find a good ground . But without out getting out the DVOM an testing this is just a guess. Looking at the wiring diagram all thing's your having problems with ground at the same place . G-400
SOURCE: 2003 Sienna tail lights don't work when headlights are on
Look under the dashboard, next to/above the park brake pedal, for the interior fuse box. It has a black plastic cover. Remove the TAIL fuse, and see if it is blown. This should get you fixed up. Hope this helps, and Thanks for choosing FixYa.
SOURCE: Marker lights, tail lights and dash lights do not work
I had a similar nagging problem once, though I do not recall the dashlights being involved. For me, the lines from the brakes went up the steering column to the turn signal. I pulled the wheel and inspected all the connections, and just like that everything worked again. I believe I could have tugged on the wiring harness without pulling hte wheel and obtained the same results.
SOURCE: Blows fuses when parking lights are turned on. Headlights work fine even running lights.
If it only happens when you turn the switchto the parking lights then it is most likely the swich that is the problem. Light swich failure appears to be a common fault with fords
SOURCE: 9-01 Ford E350 Box Truck No Rear Tail lights
turn off and on head lights liston for click under hood by your battery, that clicks your tail light relay. It has 4 wires in it. with head lights on 3 wires should be hot. if only 2 wires are hot replace relay.
Most certainly a wiring fault, you need a wiring diagram, these items are related as in all on same circuit. Check rear of fuse box.
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