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The two black wires are for the motor overtemp light (HOT light on dash). It is a normally closed switch - one wire went to frame ground, the other up to the dashboard mounted PC board for the hot circuit.
When the wire is grounded, the HOT light will light up for a few seconds (self-test) then go out. If the motor overheats (probably about 200F or so - just a guess) the switch opens and the light goes on.
On Comutacars there is a second switch that operates the motor cooling fan. This switch is mounted on the outside of the motor to one of the shoe bolts.
Sorry for the late reply - just saw your message today...
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