Ignition wirng harness

As 67Dart273 suggested I have read the articles on Voltage drop, I did find a few new ones I have never read. I will say thank you to all of you guys for the help. You spend a lot of time trying to help us electronically challenged!! ! When I see I will have a problem, I begin with all the recommend cleaning of connnnector, grounds, etc.
I admit I have never used a multimeter much for trying to find shorts, as connections under the dash are rally hard for me to get to at age 70. I been bucked off, run over, stomped on, neck and back broke, and had triple bypass last Sept! Oh yea, hit head on by and 80 mph drunk at age 25. He was driving big Lincoln!!! ha ( He won't do it again RIP asshole)