No spark...

By "coil tower wire" you mean the one going to the distributor? Done that at first, no spark from the coil, that's where I get pussled since the ballast resistor & coil both do get 12v...
& nope; there aint no computer in any of my cars.

& one thing I wonder is when people write that the coil should be grounded..? It's painted in thick black paint & the holder also so I doubt that grounding the coil is needed since it always worked before.
& the minus/negative on the coil is connected to the ECU.

What I really would like to know is how to messure the ECU (as it is by itself!) not connected to anything at all, that would be nice to know!