Join Date: Nov 2007
Bronco Info: 78 bronco xlt just an original 'oldie' cruzin'
my old 78 bronco had an issue like that when I installed a new engine, couldn't figure it out, just looking to dress it up until I could figure it out I relplaced the wiring harness going to the coil and it worked, this was 12 yrs ago, found out there was a wire w/ a break in it, who knows it may work for you too...., my 77 crew cab has a bad ign. sw,..... the prior owner replaced the sw. and it would not start, I ran a jumper wire from the + side of batt. to the + side of coil, use key to crank it,... runs... and use key to shut off,.... just the ign sw/key does not provide + to coil, being that I am swapping the cab it made no senese to fix it.
hope this helps..good luck