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Hello my name is ***** ***** I would like to try to help, May I have the model # of the timer please?
If the timer has multiple out-puts this could happen, its easy to overlook programming nuances, possibly only "output 1" has been programmed?
And the manual on arbitrarily controls all outputs
i am assuming all the lights are running off of one transformer?
that is odd, if the transformer is feeding all three lights through one output..then they should all come on when energized...i am wondering if the light string connections are good. Is the light that comes on alone closest to the transformer in wiring?
the obvious answer is somehow the two strings are defective, what make / model lights are they?