Intermittent crank no start

The other day I tried but I didn't have long enough wires on me. I'll get my jumper cables and give it a try. I don't have a rifle brush but I found this tiny plastic bristle pipe cleaner type thing that's been doing the job haha.

So if the 12v jump to coil positive does get it started the assumption is that something upstream from the coil is causing voltage drop?