Connections to the radio suppressor relay were definitely the cause. The relay seemed fine but the connections were not. We took things apart, cleaned, reassembled and away we go. When we unplugged the unit, the connector seemed to fall apart. The pins slid out of the plastic plug and things looked dirty and cruddy. As a matter of fact, when we first unplugged the unit, some pins released and others stayed connected and the plug slid down the wire. We ended up threading
the pins back thru the connector and securing each one individually. Then we slid the connector itself back up into a locked position. Thanks for this solid trouble-shooting cause.