Customer shut refrig off so it was only running 20 hours before I looked at it. Some frost on back wall and the coils were iced up. Heater checked out ok and as I said; I by passed the defrost limiter, changed the timer and did an amp check on a heater wire but got nothing. Tested the fan motor with a test cord. It was ok too.
Has to be a burnt wire in the harness.... somewhere. Time for a new refrigerator.
Thanks for everyone's help. This was a new one on me. 12 years in the business.