New guy here. I found a post with the same problem I am having with my 1994 Dodge. I did not read/find the resolution/fix in the thread.
I have head lamps but no running lights or dash lights. All other functions seem to work.
I checked the 15 A fuse and it is ok. I also pulled the connecter for the towing light harness.The light switch has been replaced. I found that the plug in the old unit was melted in some places and replaced it with a new one.
Any one figure this one out yet?
I did find that there was continuity between a Blk/Blu wire and blue wire. This would be U and B3 respectively on the switch post terminals.
If I slightly pull the switch at an in between distance, the running lights and dash lights come on but not head lamps.
This must be a simple detail I am over looking??
Thanks for the help