I can still hear my father telling me, with my first electrical issue, "probably a bad ground". Since then, whenever anything goes sideways with my electrical issues, more often than not, that ends up being the problem.
Even in my most recent debacle, it was ground-related. However, it wasn't that the ground was bad/missing, the problem wire inadvertently ENDED UP getting attached to one of my grounds (smacks head). Nevertheless, grounds are probably the #1 issue, from my experience.
You have some really smart people contributing in this thread- I have no doubt that the issue will be resolved very quickly!