delco 10si alternator [CLOSED]

[Southbuck]

My project is a delco 10si with windblue pm rotor. My tests include 3 stators, one 63amp one 37amp and one special wound low wind stator from windblue.

First test

63. amp stator
    
5. 67v dc @400 rpm
   
17. 53v dc @1200 rpm
    
37. amp stator
    
7. 0v dc @400 rpm
   
20. +v dc @1200 rpm
    
3. 0v ac @400 rpm (from each of 3 phases)
   
9. 1v ac @1200 rpm (from each of 3 phases)
   
   

windblue low wind stator

(tester overloads @20+ dc volts)

20+ v dc way before my cordless drill is close to 400 rpm

I cant even test dc @1200 rpm, way too much

13. 3v ac @400 rpm (from each of 3 phases)
    
40. 0 v ac @1200 rpm (from each of 3 phases)
    
    

Im turning alternator by my cordless drill which has 2 speeds, 400 & 1200 rpm. Each test was run with fresh charged drill battery so all tests started with the same devise at the same charge turning the alternator.

I priced magnets, wire and all the stuff to try to assemble my own alternator but found I was better off letting those who "know" build em. I have nothing lying around I could say "I built this from scraps" so I bought it ALL! That being, the rotor and stator from windblue. Im tickled at the results so far.

Comments disabled on original posters request.

[finnsawyer]

Ever hear of a "voltage divider"?  It's simply a large value resistor in series with a lower value resistor, such as a 10k in series with a 1k or a 1k in series with a 100 ohm.  Such an arrangement would give you 1/11 the voltage across the lower value resistor as compared to the voltage across the two together.  You can pick the values to get any ratio you like, such as a 9k with a 1k to get a 10 to 1 drop.  You can also get scope probes that have a 10 to 1 drop built in.  

[Southbuck]

voltage devider? vs cheap tester that will test over 20v dc?