Run a full test of everything: Switch, Lamps, flashers, solenoids, etc. This could be a symptom of a bigger issue.

Check to see if power is coming off of the bi-directional board... the connector to the motor is famous for causing a break.

Run a continuity test (power off) from the bi-directional board along both wires to the motor. Test to the lug not to the solder joint because the solder point my be flawed.

To test the power out of the bi-directional board (power on) put the probes of my DMM into the machine side of the connector to see the signals coming from the board... I'm just reading the voltage here. The motor is NOT in circuit at all.

The issue could be more complex, but let's hope for simple. Broken wire, bad connector.

faz