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Had a relative look at the mower. His tester showed the battery fully charged, but no amps. I didn't think to check amperage. Hooked jumper cables from his vehicle to the mower. And the display came...

Model 917.28858
Fuses looked fine, but will test with meter. Will try your advice on key switch, but it's a molex connector and I don't know which slots to check.

I'm a novice, and there is absolutely no electrical power. Fuse good, battery fully charged. Not even a hint of display on the usage meter. Sears was no help at all unless I wanted a service...