Autohelm 4000 question

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junaido

I have an autohelm 4000 which is not powering up. No red standby light or other signs of life.  There are 4 wires (red/black, blue/brown pairs) in the connector. I am assuming one of these pairs powers up the control box and the other one would presumably drive pulses to the motor which drives the wheel with a belt. I am not sure which pair is the power source or even if this is a correct assumption. I am seeing 12V on both pairs when I turn on the autohelm at the switch panel. Even without the control panel connected. The picture shows voltage on the blue/brown pair (wire is not connected to the board) and the polarity seems reversed (blue should be negative but is positive). A later probe showed 12V on the red/black pair as well. Anyone on this forum have the same unit? Any info on the wiring/troubleshooting? Thanks.
1986 #105, std. rig,  M25, Everett, WA

junaido

Pic
1986 #105, std. rig,  M25, Everett, WA

Roland Gendreau

Roland Gendreau
1992 MK 1.5
Gratitude #1183
Bristol, RI