Ammeter pegged...

Lunch crank. You can see it went way high (not pegged) for maybe 10 seconds, and then dropped to normal when I wasn't looking.

… Trying to figure out how to attach a video …
Can't help with the video, but don't worry about it too much. It's pretty clear from your description.
I've got a multi-meter already. I'm pretty sure it has something to do with electronics...
Your already headed in the right direction! thumbs_up-gif.gif
Set it to V DC, or the V without squigley lines.
Clip or hold the black wire to a good ground or battery negative.
Use the red probe or clip to measure the voltage at the places mentioned earlier in the thread. Battery Pos. and alternator out are good places to start. Note the voltage engine off, and running. Slightly rev the motor using the throttle on the carb if you have to. Note if the voltage follows the rpm.