Hi Leroy
Sad to see that the transformer is misbehaving for you. Seems this may have been your problem early on when you were having battery discharge issues.
There are perhaps two other people who may be able to shed some light on your problem. One is Frank Cox from Haul Truck Australia, 02 4577 6577, he is an ex-Letourneau/Wabco man from the Rydalmere factory and the other is Peter Hawthorn, AustParts 1800269221 (after hours). He is with Preston's, the old Wabco parts suppliers in Brisbane, but does his own thing after hours.
They may even be able to source a replacement transformer if yours can't be repaired.
Also, if you have it, pages 99 to 104 of Phil Gowenlock's book Wabco Australia contain a really good description of the LW/Wabco electric circuitry with diagrams showing each different circuit. If you don't have it, you can get it direct from Phil through
www.tournanet.com, or find it on ebay.
Best of luck
Gordon