I have an isolated 36/48V input, 12V output DC-DC converter that I would really like to be non-isolated.
I need to have a common ground so that I can control 36V and 12V devices both from my arduino (through transistors / relays of course). If I just add a simple common ground connection, the output of my converter jumps to 36V.
Without the common ground connected: If I measure using the 36V ground to the positive output of the converter I get 36V, and 24V at the negative output. If I measure across the output of the converter I get 12V of course. Unfortunately I do not have a datasheet for the converter, but it is typically used in the golf-cart world. It is good for up to 25A at 12V.
Please help me make my isolated converter into a non isolated converter.