Group: For the ones that are intrested technically. I was working on 6935 and took the RPM relay out to clean the (contacts.) Much to my surprise the PC board had a factory modification and it uses a single (contact) for all the load: This may be why some of the earlier versions failed to soon due to the overload. My 11004 has a double contact relay inside to better distribute the load.All the ones I've been sent to clean and repair have had two contacts. Strange%$#&^. John Hervey www.specialTauto.com