Question about Vivitar 285HV Flash
Red wire (positive voltage) goes to center pin. Black is ground, goes to outside shield or shoe edge contact. If the wires are reversed, a simple test switch will still work, but a photo slave will not (because it is powered from the +voltage so it depends on the polarity to be correct). Of course, the small PC contacts and cables can be unreliable so it could also be a bad cable. For much more detail and photos see: photo.net/photography-lighting-equipment-techniques-forum/00Po9t
Below is a utube Video of exactly how to do what you want
Posted on Aug 19, 2010
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Posted on Jan 02, 2017
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