American Motors: 1979 cj7 4.2l auto- not firing, electric fuel pump, coil wire

Question
bit on the cusp of 1979 limits!

i've got a 1979 cj7 that was working fine starting etc until onday it didn't! it turns over fine but never fires. at this time the circiut with the cigg lighter- radio- electric fuel pump stopped as well. i've tried the electronic ignition box no change, and checked all the normal fuses etc...just wondered if you had any possible tips/ things to try?

Answer
George,
Using a test light, turn the key to the run position. You should have power to the (+) side of the coil. During cranking, the bulb should pulse on the (-) side of the coil. If you have power at both places, remove the coil wire from the distributor cap and hold it 1/2" from the engine block while cranking, you should have a strong spark. If not, check the coil wire for an open or replace the coil.
No power to the (+) side means that you have an open between the battery, ignition switch and coil. For a TEMPORARY fix, try running a wire from the battery (+) to the coil (+) and try cranking it. DON'T leave this wire in place too long.
No flashing light while cranking at the (-) side means you have a defective pick up in the distributor, a bad coil, or ignition box.
I would also check the circuit your electric fuel pump is on. Find out why you don't have power there or why you are blowing the fuse.
Good luck
Kevin