I've got a '84 Ford F250 and I went to turn on my 4 way flashers the other night and the lights came on but didn't flash.<p>Looks like there are 2 flasher units- 1 for the turn signals and another for the hazards based on my Haynes manual The turn signal unit is right on the fuse block - I already tried replacing it without success (the turn signals worked fine before & after). <p>I've looked a bit under the dash but can't see anything that even resembles the flasher unit. Any suggestions on where to look?<p>