Sewing Machine Won't Work?

I bought a Kenmore beginner sewing machine at a garage sale, but it didn't come with a manual or power cord. I got the manual off the Sears website, and found a 6V power cord at home. When I depress the foot pedal, it makes noise, but nothing happens. If I turn the handwheel manually, it will sew and the stitching holds nicely. Why won't the machine work electrically? The bobbin winder won't engage, but will thread manually as well. The machine and bobbin are threaded properly. I have followed the manual meticulously. Please help! Thank you.

By Sandra G