Power Supply rail shorts to ground when loaded
By default the outputs of your supply are floating. That is they have no electrical connection to earth ground. It's like a big battery connected to nothing.







simulate this circuit &ndash; Schematic created using CircuitLab

The green ground connector goes to the earth ground. If you connect either side of the battery to ground it references that side as ground and the other connection becomes either a positive voltage relative to ground or a negative voltage if you attach the red side to green.

However, if everything is wired correctly there should be no current flowing through that shunt to ground. As such, it does not really matter if it is shunted with a wire or with a resistor since without current there will be no voltage drop across the resistor.



As for your voltage divider idea. It is not at all clear what you have tried to do here.

I suspect you are trying to do something like this...







simulate this circuit

Unfortunately that does not work since the load changes the bottom resistance of the divider and thus the voltage. But you may well be doing something else... add a schematic to the question.