Response to I have a PX300 trying to run a pool light by Haywood, 12V 300 watt. The pool light would come on sometimes, then shut down. I had a spare PX300 new. Installed it. Have 12.18 volts to the light. Nothing lights. I tried 2 new bulbs. Nothing. Went straight to the transformer, hooked up a drop light with wire nuts to 12 volt leg and ground. Nothing. Ideas? Am I missing something?

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