Headlite help please

[Small Block]

I've got a Ford 1 ton dually. 94 model and it seems to have developed an issue with the headlites blinking on and off. Not sure if it's the on/off switch on the dash of the hi/low lever on the column. When they go out i can pull the lever back to me and they will come on and remain on high if i hold it to me. It seems to be more of an issue on high more so than on low. Where do i start? Looking at the Haynes manual now.
Small Block

 

[OneOfMany]

Just a guess, but I would guess heat from electricical resistance is tripping something. I am guessing the stalk wiring runs through the main on/off switch, so if that was the case, then holding the stalk on high should trip the main switch if it was the problem. I'm guessing it's the stalk.

Grant

 

[Divenut]

Loose ground wire somewhere?

 

[Demonracer]

Possibly a bad headlight relay. Find the wiring diagrams in the Haynes manual and look for the relay.

Bill S.

 

[Coyote Jack]

Had the same thing happen in my 98 Ram, Bill. It was the switch and it can be very bad, as in cause a fire if left unattended.

Jack