dave-r wrote:Resistance reduces voltage. If the voltage is higher at the VR (too high actually) and lower at the battery, then there is a higher resistance between the alternator and the battery than there is between the VR supply and the alternator.
Or the battery itself is bad and acting as a resistor.
This is a scientific truth and a critical point to take to heart if you see voltage dropped across connectors. Resistance reduces voltage because the point of resistance absorbs the energy necessary to overcome the resistance and the result of that absorbed energy is heat in the connector. This is why Mopars have melted firewall connectors, melted engine harness connectors, etc. I have experienced this first hand. The connectors contacts get corrosion in/on them and this makes them less conductive (more resistant) and so they have voltage "dropped across" them and they heat up a lot, which can increase the voltage drop more ....it cascades until the connector melts or sometimes actually catches fire.
I don't know about flicker but almost every odd wiring issue I have had was sorted by cleaning the connectors and making sure the ground was good - as long as you've not messed with wiring otherwise. If you have been changing things you could have undone something. If that's not possible, I'd go thru all of your connectors (engine, firewall, front lights, etc) especially those exposed to the elements to give them a cleaning with a chemical cleaner and elbow grease with some sort of abrasive to get the tabs and the female socket clear of oxidation. Then put in a bit of electrical contact grease. That's a poor man's new wiring harness.