How to test output on my 25 generator/starter

[fsnooks]

Starter side works OK.

 

How do I test output voltage? 

 

Can i adjust voltage. It appears low.

[MikeC5]

I'm not sure how you would do it to bench test.  If you can find an place that specializes in rebuilding alternator/generator/starters they would probably have a way to do it but those types of local businesses seem to be very thin on the ground these days.  If you test it in the car, the amp meter will tell you what's going on.  At idle, with headlights off, the output should show on the + side (10 amps on mine).  With headlights on that will come down some but should still be on positive side.  What is a bit counter intuitive is that with increasing rpms the amps will drop (it has to do with how 3rd brush current regulation works).  Ideally you want to adjust the 3rd brush so that at normal cruising rpm (with lights on), you are still on the slightly positive side of zero on amp gage.  Otherwise you risk overcharging the battery.  You also want to double check the connections to the starter switch and make sure the starter cut-out relay is working.  This thread may help also.

https://forums.aaca.org/topic/228044-starter-but-no-generator/page/2/