I think Sears would be an excellent place to get started.
They will give you two tests:
One is an ethics test that will ask about how much you can justifiably steal from your employer, whether you like to beat people up or not, and other similar questions. Answer that one from the employer's perspective and you should do ok.
The other one is mostly on how to use a volt-ohm meter, and the wiring in typical sockets. If you know basic household electric, and are familiar with the meter's use, you should pass that one no problem.
I passed the tests, but didn't make it through the interview because my appliance repair experience was in my own business. I guess they were concerned that either I would not do it their way, or would be side-jobbing them with their customers. Seems like a reasonable concern.