(G) writes:

I have a system that worked. Had a lamp and a ballast. It quit
working. I replaced lamp and ballast, check everything except the voltage
between the ends of the tube. The filiments light. My question, its a two
lamp ballast that has two unused wires. Having only one lamp connected,
could this cause a reduced starting voltage across the lamp. I am suspecting
some weak link and not a hard core problem.

Where are you located? What is your line voltage?

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