A 600W transformer (with 80W load) shows 107V at the timer outlet but there's no voltage on the secondary taps. Conditions and hints: - A single wire run (with 80W load) is connected to the 12V tap and common #1. - There's nothing wrong with the transformer (a second transformer was checked with the same results). - The transformer contains no electronic components (that require higher voltage to function). - The GFCI outlet checks out OK (also polarity is OK). Why is there is no voltage at the secondary? What tests would you do to find out?