I would, just make your own, there is an easy firewall access behind battery in passgenger side, behind glove comptartment. When you bring these wires through, you can hook up as many things as you need to the positive wire. later you may want to add an inverter to it. that is why i like it to be heavy gauge because over the years you may have alot of things running from it. If you use one of the existing thing wires, you could keep blowing fuses, then you have to find which fuse etc.
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.