Re: generator output
There are a number of possible reasons for a jittery output. One is the meter. Like others have said, try an analog one. The commutator could be dirty. Take the rear cover off an see if it is not bright shinny copper. The brushes could be bad or not making complete contact. Make sure the brushes are moving in their holders and they are not worn to the point of not being able to make contact. The other reason is a short of open circuit in the armature. You will have to take the generator apart and put the armature on a growler to test it. The cutout could be bad. To test it, at a fast idle, bypass the cutout to see if the voltage and amperage output comes up.
Or, it could be bad connections to the battery or the battery ground. Any connection along the path to the battery should be checked for bright metal and tightness.
If you intend to do a lot of driving and don't intend to enter 100 point judging, an alternator is a nice upgrade.
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