YM2000 Alternator testing

[Mslater]

Ok, I set my meter on ac and test which outputs? Thanks!

 

[normde2001]

You want DC, put leads across your battery terminals, looking for +14vdc+- at high idle.

 

[Mslater]

Thanks I'll check it out again!

 

[Mslater]

I checked at the batt running at about 1500 rpm and get 12.3 volts. Now that I know its not charging how to I narrow it down? Whats the procedure to test the alternator seperately? Thanks alot for your help!

 

[normde2001]

I'm not sure if your bridge rectifier is in the alternator or the regulator; however, you can unplug the regulator from the alternator and meter across the alternator post and look for +20+- volts on AC or DC scale. No voltage says bad alternator, +20+- says bad regulator, AC or DC reading gives the location of the rectifier, which changes voltage from AC to DC. It's usually a bad regulator.

 

[Mslater]

Gotcha, I'll give it a shot tomorrow. Thanks again!