I have an edge bar from my old truck and I am thinking of cleaning it up and checking the power supplies. I also want to add extra strobes to the unsued options on the supplies. What is a general rule of thumb for the wait time after powering down the bar before you can work with the wires and connections? I want to check flash patterns as well as group which strobes fire togeather. I would also like to know if I should unhook the power and ground wires from my power source after powering down and before I begin to work on the inside.