4-Pin XLR power supplies

Does anyone know what the connection pins are on those 4-Pin XLR power units commonly used for video cameras or camera mounted lights? I know it's 12V 1.2A but I'm not sure which pins are used for what (i.e. pos, neg, 0V, +12V) I want to turn a normal adapter into one with a 4Pin XLR connector to be used with a camera light.

Picture of 4-Pin XLR power supplies
Goodhart9 years ago
A little prodding about with a decent Volt-ohm meter should give you an idea.