I own a 2000 f150 and if I flip the brights on the headlights shutoff completely.The dash indicator dosen't come on either.Any ideas?

 

Did you check the fuse ?

Did you check the bulbs ( easiest by checking the bulb connector for power with a meter ) ?

Does the same thing happen when using Flash to Pass ( pull back on the MFS ) ?

 

The fuse is good.I didn't check the bulbs because the indicator in the dash dosen't even come on.Lights shut off even if I pull back.Thanks for the quick reply

 

If you have confirmed power on both sides of the fuse with a meter, then the only part left is the MFS.

The indicator is on the same circuit as the high beams, so you are correct, if there is power on the high beam circuit, the high beam indicator on the cluster would be illuminated.

Time to remove the MFS and test the switch in it.

Thread on the MFS
https://www.f150online.com/forums/el...on-switch.html

The test chart :

 

That's awsome man thank you very much.Will check it out this weekend when I have time.

 

Just saw I did not paste in this thread

https://www.f150online.com/forums/el...beep-beep.html

You might need this to get the ign cylinder out, so the upper steering wheel cover can be removed ( without bending the snot out of it ). Just so you have it handy in case. Look for a post by JMC, he wrote up the procedure on how to remove it.

Another quick question, when you checked the high beam headlamp fuse #3 in the cab fuse panel, did you have the headlamps turned on, and the MFS pushed forward ?

A quick test ( if you have a steady hand ) is to apply +12 V DC to the pin in the back of fuse #3 ( passenger compartment fuse panel ) with a meter probe or awl.
To do this, have the truck off, and the headlamp switch turned to the OFF position. Either side should illuminate the high beams if the fuse is good.