VintageMBike said:i put the system in. At Idle im at 12.4 12.5. At 4k rpm im at 13.5 and up
Is this acceptable? Also, if I put the headlight off (i detached it) things run a lot better. Not sure what kind the bulb exactly is, but its says H4 on it.
Sounds about right.
At idle it sound like you're running off the battery. Ideally you want to be seeing about 13V before you can consider the system to be self-sustaining, but that's not super-common on permanent magnet alternators for vintage bikes.
H4 halogen bulb can have a very wide range of wattages, so just being H4 doesn't tell us a lot. If you plan to be idling a lot, a swap to LED lighting might help.