Ram Headlight Problem

I have a 1998 Dodge Ram 1500 Sport. When I have my headlights on bright they sometimes flicker off leaving just the fog lights working. When I put them back on dim they work fine. I tried turning
off the fog lights and turning the headlights on bright but it did the same thing. I replaced the headlight switch with a used one over a year ago. I am wondering if it might be the turn signal lever that is bad. Any help would be appreciated.
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With the headlamps on, you will have voltage on the lg/bk wire going into cavity 21 on the dimmer switch. <multifunction switch> If you have voltage there, you're headlamp switch is ok.
The wire for the dim headlamps is the vt/wt wire coming out of cavity 18. The rd/or wire out of cavity 20 is the high beams.
Hope this helps
Denny
I just re-read your post. Your fog lamps shouldn't be on when your high beams are on unless somebody has modified the wiring.
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No, my fog lamps are not on when the high beams are. It is when the beams are on high the head lamps go out leaving the fog lamps on only, unless I have them turned off.
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Not sure if this is applicable for the 1998 model, but some of these problems were blamed on cracking dashes which push on the wiring. I have a 2000 model and was affected by it. Now reading you post, I recall having had similar behavior intermittently with my headlights to the extend that it went completely dark. My dash got replaced by the dealer for free by now over a year ago and I have not had a problem with the headlights since. Again, not sure if that has anything to do with, just a thought.
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