Voltage Gauge wiggle w/ turn signal normal?

[patrickt]

Originally Posted by jhv48

One wire alternators are grounded to the engine block by the mounting bolts that hold it in place to the engine block. No additional grounding wires are needed. Your alternator is correctly installed and wired as is. Hence the name “one Wire alternator”.

Sometimes mounting bolt brackets are powder coated, sometimes brackets are painted, sometimes the fasteners at the block or water pump are slathered up with RTV, sometimes there's a plastic washer between the fasteners, sometimes there's a rubber insulator.... The only way you can tell if a ground is really good or not is to measure it under load. Or, you can take a shortcut and just eyeball it and say "yeah, that looks like a pretty good ground to me." But you have to measure it under load. Just like measuring the resistance of a filament in a light bulb -- you have to do it when the bulb is lit, otherwise they all read 0 ohms.