[Dannyboyo]

After trip to local shop, my rod has alternator hot if sitting w/ engine off (not after running).

Ideas?

 

[hydro462]

Sounds like the Rectifiers may be shot back feeding electric to the alternator and making it a motor only it can't spin because the fan belts keep it locked up...

 

[oldcutlass]

Hot as in temp or hot as in voltage?

 

[B52bombardier1]

Get it tested but as advised, probably bad diodes in the rectifier. I'd bet a lot of alternating current is reaching your DC-loving battery.

Rick

 

[DUTCH MAX HEADWORK]

Your regulator contact could have welded together too or something is applying power to the field terminal. Pull the plug off the alternator and check to see if there is power on the F terminal. If you see power there, you need a new regulator or need to find the source for the voltage.

To test for a faulty diode, set your multimeter to ac volts. Test black lead to ground and red lead to charge post of the alt. Replace or rebuild the alt if more than 50mV is detected. In order to get a reliable reading, your battery should be fully charged before the test.