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What make , model an year vehicle ?
We have check switch on dash??WIth new one!! Still nothing ... Did you check B+ voltage in an out of the switch with a volt meter before replacing it ? This eliminates replacing parts needlessly . Your best bet , take it to a qualified repair shop that knows how to test automotive electrical systems an circuits .
In almost every case this is caused by a overheated and damaged headlight switch and the large connector that goes to it, both parts are cheap and you can get the switch and the repair connector from any NAPA or Carquest auto parts store. The headlight connector and switch must be done as one repair or the new headlight switch will quickly stop working again due to a poor connection of the connector. When the connector is replaced it must be soldered the wiring harness and shrink tube for insulation of the connection, ONLY DO ONE WIRE AT A TIME.
Almost certainly its the relay. In the fuse box there will be a number of box like objects. One of these is the starter relay. Check with manual and replace the relay. Sometimes you can get some temporary relief by tapping the relay or removing it and replacing it. If that doesn't work you'll need a new one.
It sounds like you ignition switch went out. I had this happen to my wife a few years ago you turn the key the acceseries turn on but nothing else. this will be a trip to the dealer. did you happen to smell something electrical burning the last time you car was working if so it is the starter switch. you will need to take it to the deales an get a ne w switch which will also involve new keys$$$
I had a similar problem with my 99 Suburban. After not being able to solve the problem for about six months, my headlamps stopped working on the low beams. This led my mechanic to change the multi-function switch on the steering column (turn signal/cruise control switch/high beams) When he did this he discovered that the wire terminals at the switch had gotten hot enough to melt a little, this allowed the ground terminal to slip out of the connector. Once replaced, the cruise control miraculously started working again. I have had no problems with it for the last four years. The local GM dealer told me later that they had quite a few trucks with the same problem and it typically started with customers noticing that their cruise control stopped working. Give this a try!