Thanks Dave for chiming in. ?The AIU board Gnd is connected to the Separate Accy Power Bus, on the ?¡°-¡° side of the power supply. So am attaching Pin 5 also to the same Gnd on the Accy Power Bus, which is also the AIU Gnd.
For each Tortoise, both of those connections must be removed and replaced by a separate (otherwise unconnected) direct wire going between pin 5 and the single relevant AIU GND.
Dave in Australia
