I extended my new 50 ft low voltage garden lights with a 17 ft wire using a low voltage cable connector. The 50 ft is 12/2 with 7 lights and the 17 ft is 16/2 with 3 lights. All 10 have 4 watt bulbs. The 3 lights work and the 7 won't work, even when I remove the extended wire. The control unit is a 48 watt (input 120 vac, 60 ha, .42 amp. Output max 48w, 12 vac) All connections and bulbs are good. What have I done wrong since I can't even get the 7 lights on the 12/2 to work solo?