Step-son looking for a scooter for the last year. He found and bought a Spree for $50 (yes, I warned him of buying a 'project').
I'm not a mechanic (uh oh - here it comes), but do my own wrenching on my cars/bikes. When it comes to electrical, I'm in trouble, and diagnosing issues isn't a virtue of mine.

Patient:
'84 NQ50
Status when purchased:
Non-functional and in need of much TLC. Wiring was hacked, tires flat and missing misc. plastic pieces.
Current status:
Ebay comes thru again - bought most of what we needed.
- Installed used harness using the wiring diargram provided on here (Thanks!) - 95% complete.
-NOT connected: front/rear turn signals, rear brake light, horn (MIA)
- newer gas tank
- Carb kit from Honda (if you'd call it that- really just 3-4 orings and a gasket)
- New Battery
- New spark plug
Issues:
- Key ON, kill switch @ RUN, Oil light illuminates - but when pushing the starter button we get nothing @ all - no crank, no noise.
- Checked: On centerstand and left (rear) brake lever in locked position.
- Battery - 12.5V
- Getting 12.5 V to the Starter Relay but it goes to 0v when we push the starter button>>is this correct??
- Haven't tried wiring the starter directly to the battery
- No clue on condition of coil/reg-rectifier/stator/alternator/etc.
If there's a 'troubleshooting' guide on here, please direct me to it....working my way thru the Factory Service Manual's TS section, too.
Thanks,
Td