Your system isn't broken, it's just a little bit neglected. Both are critical for a 6V system to be reliable and strong, and the fix is inexpensive and easy. Grounds get dirty and rusty and nobody checks them, so resistance goes up. A lot of 6V cars are running parts store 12V battery cables, which are much too small. As heat goes up, so does resistance, so hot starts can be a problem for cars where the electrical systems are marginal. If you improve your grounds and make sure they're all clean, install heavy (like 00-gauge) battery cables, and perhaps add an extra ground cable from one of the mounting posts on the starter to the frame near where the battery is grounded, things should improve. The re-start problem sounds like the typical hot start problem that many 6V cars have. If you want, you can read up on proper adjustment of the voltage regulator and make sure that's correct, plus clean the points inside the regulator, but irregular spikes like that aren't unusual during charging.
It will not be a linear function, so the bouncing around you are seeing is normal. It's either on or off, so it modulates output by rapidly opening and closing the points depending on the amount of charging required. The regulator uses points to control generator output. However, if your battery is healthy, it won't mind the brief periods of discharge and it should have plenty of reserves so that you never have a problem. Generators don't put out much amperage at low speeds (or high speeds) which is why everyone eventually switched to alternators. 0 or a negative reading at idle is normal and it should pop back up once you accelerate, top off the battery, then drop back down to 0 again. You will see charging while driving until the battery is fully charged, then it will gradually taper down to 0. It sounds like your system is operating correctly. Does this raise an immediate flag to anyone? I have a pretty detailed article on testing the generator and voltage regulator and plan to do so, unless someone might know what this fluctuation could be. Like there's intermittent breaks in the charging. The meter drops to 4, 3 and even 0 for a split second then back up to 6 or 7. Increase rpm's and meter reads 7+ volts.but here's what I see. All I've done so far is charge the battery back up, start the car and hook my multi-meter to the battery. I'm questioning the charging system at this point. Car finally does catch and back home we go. Ready to disembark and engine turns over very very slowly almost not starting at all. Maybe this is normal? Stop at ice cream shop after the hour cruise. Shows discharge at stop lights especially when turn signals are on.
Voltage gauge shows charge at start and kind of peters down during cruise. Good strong start and off we go for an hour cruise.
Newer battery with good clean solid connections in the electrical system.
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