I have a 2000 ford taurus with auto lamp, my low beams and datime running lights work fine but as soon as i put on high beams they do not work,i changed the multi function switch,the generic electronic module and of coarse the bulbs,the relay and dash indicator for high beam are working.what could be wrong with it.

SOURCE: 2006 ford freestar high beams

there should be seperate fuses for the high beams in the under hood fuse box try checking them

SOURCE: high beams wont turn on.

First place to start is with headlight switch. I did have a case many years ago when both high beams were blown out at once, but this is rare. When you have the headlight switch out, jump power from te low beams to the high beam contacts. If high beams come on, replace switch.
Bill

SOURCE: drl not working nor are low beams high beams work properly

Ok look under the bagtterry tray, there is a black box bolted to the body, it is the headlight ground and has a really bad tendency to corode due to the design.

SOURCE: LOW BEAMS NOT WORKING 2002 FORD FOCUS

Hi. i recommend a thorough inspection of the wiring harness and harness connectors that led to the actual headlights. use a volt meter to test the current flow to the connectors. pull the connectors from the back side of the headlights and test all cooper contacts inside the connectors. If the wire contacts all show voltage, this will confirm a switch malfunction. it should be replaced in this case.

Now, if one or more contacts on the wires harness fail to produce any voltage, this will confirm a faulty wiring harness. replace the wiring harness in this case.

Make sure the headlight switch is in the on position when testing the wires.

SOURCE: Low beams stopped working

There are two fuses...one 15amp that is for the daylight running resistor, the second one is a 20amp which is for the headlights...both of them are IP(Inside Panel), not UP(Underhood Panel) which means both are inside the vehicle. The dimmer switch receives power from the 20amp which by switching it causes the power to go to the high or low beam. That being the case, it would appear that your dimmer switch which is under the dash, located on left lower side of steering column, would be the likely suspect.