Okay so I am getting ready to install exhaust brake switch. I want to connect it so that it turns on tow haul also. 1 switch turns it all on. So I have dpdt rocker switch. What I am lacking is info on tow haul activation. I have looked an not quite found what I am looking for. Is the tow haul activated by a momentary button? Or does it latch some where else in the program/bcm. If I connect a button in parallel so it is on all the time will cause a problem. Also switch i have has led light w/ 100ohm in line. Will that cause an issue in series with this? I could do it with a relay also but if the coil of the relay is in series with exhaust brake wires will that cause a problem? I have heard an led will what about a coil from a relay?