same problem here. I have changed out all of the relays associated with the blower. I also noticed that when the blower doesn't work, the A/C compressor doesn't either. I have been told to change the resistors that go to the blower assembly but have yet to find one that I can use. I have pretty much just givin up on it. I did find though that if you put one of the gray relays from under the dash into the relay plug under the headlight your blower will work just fine, however it won't shut off when you turn off the key and it will also run down your battery.

If anyone has ever figured out this problem successfully I would gladly pay for the solution <img src="/forums/images/graemlins/scared.gif" alt="" /> It has driven me crazy for almost a year now. The local shops either won't even touch it or they want more than the Trooper is worth to fix the problem