I'm refurbishing an old Black & Decker 6" bench grinder. It's got a power cord, an On/Off switch, and an A/C motor. The motor doesn't energize, even with a manual start, and I'd like to check the circuit.
The motor has three wires, and there's a gizmo I don't recognize. It could be a thermal overload protector, or it could be a starter circuit, or something else I haven't thought of.
I'm familiar with A/C motors having multiple windings for speed settings (common on fans) but this grinder doesn't have a speed control.
My questions are:
- What is the black Bakelite item?
- What circuit tests are appropriate to diagnose and repair?