Voltage Regulator

[cb750]

My '75 isn't charging.  When it's under load I'm only getting about 12.4 volts across it so I'm starting to investigate where the problem might be. The bike left me stranded a couple weeks ago, I was able to kick start it and get home which was cool. But my old Chiltons manual tells me in order to check the alternator output I need an ohmmeter and a voltage meter and you connect them in series to the positive side of the battery and this will tell what the alternator looks like...well no a  days you buy these digital multi purpose meters so I don't know how to hook that up to the battery and check alternator out put??? Any ideas woould be great. Plus I discovered there are actually points in the regultor that might need to be re-gapped....I tried it but not sure I got it right..is there any test using the multimeter to check the regultaor?

[TS750c]

Go to the auto parts store like advanced auto, or auto zone (i got mine at advanced) and go by all the testers and there will be a little tester thats 1 inch by about 7 inches and it has a positive lead and a negitave lead, it test battery volts and alternator or in our case stator votls. it also has a little magnet so you can put it on a tank, I believe that for the alternator you have to be atleast above 2,000 rpm's to get the charging system to work. If that checks out ok check your rectifier.(spelling?)

[cb750]

Thank you for the help, I'm still working on the bike. I ride it and work on it to minimize down time. I have a multimeter but I'll go to the storte today and get the one recommend and give it a try.