I have a 1980 Dodge Macho Power Wagon I have been daily driving the past year. I noticed the electronic ignition module had the sealant out of the backing leaking out & down the firewall. I pulled it off, it has the 4 pins but the wire harness has 5 wires. I have one with 4 pins from a Dart that was running fine a few years back, put it in & it won't start. I went to NAPA & bought a new 4 pin & it won't start with it. I have added a ground wire running to the battery on both thinking the ground was bad but got start up. Really at a loss here on what's making the new one & the old Dart one not work. I can bolt the old melted one on & it runs with it.

Anyone have any ideas on what can be going on with this?