Need generator advice

[macdonge]

Electrical gurus please chime in. I bought a recently rebuilt 2-brush generator and set it up on my engine test stand to check it out (after polarizing per the usual procedure). It didn't appear to be charging so I brought it in to a local shop for testing. They called a while ago to say it charges just fine (up to 30 A output)... but only if it's run CCW!

Ideas?

 

[supereal]

Like many others, I installed an alternator on my car. It eliminated the old voltage regulator, and handles heavier loads of bright headlights and accessories.

 

[Brian]

Are the field wires reversed?

 

[macdonge]

My thinking was that didn't matter, i.e. the polarizing exercise would take care of that.

 

[ndnchf]

Is this a positive ground car? The generator needs to be polarized to match the system.

 

[macdonge]

Negative ground. I think I’ll try re-polarizing & reinstall it.


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[Karl Wolf]

You could check it by seeing if it motors.
Hook up a live battery to the armature connection, and the field
to positive side of the battery. Connect the negative side of the
battery to the generator body- ground. The generator should spin.

Karl