Generator light is on... what do I need to check?

Okay, I guess this is sorta "off-topic" because the truck I'm working on is a '67 "off-brand"; but considering that ALL cars running generators probably have the same wiring scheme I thought I'd ask-

I've got the truck to idle with a jumpstart for me, driving it hasn't been an option yet! As soon as I disconnect the jumper cables, however, the truck dies.

Is this a sign of a bad generator or regulator or...?
I've got an extra pair lying around (gen/reg), but have yet to install them and see if that kills the light-

Oh, if you want to see what I've got going on, here's a youtube link:
http://www.youtube.com/watch?v=ZRz26S8r30M

 

Could be either one. If you are not so mechanically inclined, take the gen off and have it tested at one of the auto supply shops. You have to eliminate something and go from there. I don't know what you are working on but there is a possibility that the system just needs to polarized if it has been apart, regulator replaced, etc.

 

A generator doesn't charge until about 1500 rpm so the light always comes on at idle.

A multimeter on the gen's battery wire should show an output of about 13.4 with the rpm's up.

Replace one at a time...... reg is easiest... I'd do it first. Could also be a bad battery - a gen should charge a completely flat battery unless it's shorted out.

 

That there Tyota Stout should have an alternator. Looks like you were messin with the ignition switch. Is it possible that the regulator is wired to the ignition switch? Is it possible that the wiring is wrong to the regulator? First take the alternator (or generator) to a competent auto electric shop and have them test it. Don't take it to Autozone or O'reillys as they wouldn't know a Stout from a Scout. Napa might be ok.