Hi Steve, on paper & real life is too different things. For whatever reason it seem the volt drop for Lucas
ignition switch is often about .5v. The kill switch.1-.2b pretty common.
I’ve never worked on Rita/Triumuph EI. Trispark
have tolerated this drop & started & ran perfectly in real life. I would have never given it a thought. Was testing for other reasons. Yes, my bike has same drop. Just today it covered 170 mile ride. Didn’t miss a beat.
Of course if battery
is low, like 11v then ignition is only actually getting 10.4v. Points not a problem. EI is on cusp of problems at least.
The plastic connector with flat pins is a problem waiting to happen. Best is cut them out & use different spades or bullet connectors. At least cut out the important wires like white & white/yellow.
Yes, do a point to point volt drop so you know exactly where the loss(es) are. Fuse is a common source of loss also.
I use dielectric grease on every single connector. Has served me well. Especially in moist/humid environments.