Still fighting the no spark problem. I installed the stock ignition so that I can just swap a few connectors from the Jacobs to the stock setup when the problem occurs. My question is, what is the little electronic pack that attaches to the side/rear tab of the stock coil setup? Couldn't find any pictures or description of it in the manual I have. Found that the truck wouldn't run unless it was electrically connected to the stock coil, so since my Jacobs setup is in the original location, I had to run a jumper from the electronic pack to the tab on the side of the stock coil. Just curious as to what that thing is, Thanks.