i have an old hiper type-m 630w psu that has 4 x 12v rails that can do 18a each and i want to power an electrically adjustable car seat with it without the heating element, is it possible to join these rails together into 1 high amp 12v output, i wouldnt be putting a heavy load on them i just need 30a for the seat as that was what it was in the car, ill be connecting all the 12v wires coming out of the psu into 1 and all the ground wires into 1.