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Is the wiring ok?
try unplugging the front ones from the flasher and jump the wires and see if they light up?
if they do you may have to replace the flasher.
if they dont light up you might have a short somewhere or something is ungrounded
or it could be both
those are my ideas. sorry if...
take a look at this...
http://www.steelsoldiers.com/cucv/27571-cucv-build-here-we-go-again.html
he has a AC unit in his CUCV :-D
granted its a long thread... but its full of info on what you "could" put in your truck :-P