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All posts in here are put up for all to read and gain information on how to do something to their silverado or sierra.Make use of the second factory battery tray and have the install look as factory as possible.The battery is then grounded to the driver side head via a M10x1.5 bolt.I also ran a ground from the second battery to the frame.The red/wh wire from the relay goes to Pin A and the black wire goes to Pin B.Once that is connected I loomed all the wires and ended up with this. It does take some time, but the wiring is solid and looks like a pro did it.So now everything is cleaned up, with our three wires loose in the bottom left corner of the above pic.
The connector we need to tap is the middle one closest to the engine.These are special crimpers used for "open barrel" terminals.You can search for "delphi crimpers" and find them. It goes on the firewall, up and left from the brake booster. If your truck is like mine, then it doesn't have the needed studs from the factory.The two 12V wires will come from the fuse block and the ground will come from the passenger side head.The orange wire is technically the "ignition 3" circuit and is controlled by the BCM. We need to add the connector that would be there if the truck originally came with the TP2 option.