Thursday, August 16, 2012
So Easy, A Chevy Guy Can Do It.
The high idle setting is intended for PTO use, but it comes in handy for warming up, charging or (as anyone who's sat in a Super Duty on a hot Summer day knows) getting that A/C to cool properly while sitting still. But besides the creature comforts it also prevents "Wet Stacking" in diesel engines. At idle a diesel engine can over-cool it's self...thus not all the fuel injected "burns off" (you need compression & heat to burn diesel). The fuel will condense and work it's way past the piston rings and into the lube oil, diluting the oil and wreaking havoc with your lube oil system.
Here's how it's done... I found the orange PTO wire that is located behind the emergency brake in a bundle of wires (mine was factory labeled) and stripped the end of it. Next, I took a short piece of 14 gauge wire and connected it with a solderless connector and crimped/taped it. I ran that wire to the fuse box where I found an empty slot. I took a 10a mini fuse, wrapped the bare wire around it and plugged it in.
Done. It was just that simple.
Now all I have to do is set the emergency brake and it bumps the idle up to 1200 rpm no muss, no fuss. Release the brake and it drops back down to normal. If you don't want it e-brake actuated you can run a hotwire from a toggle or upfitter switch and connect to the BCP (Battery Charge Protect) wire instead of the PTO wire (all the wires in the bundle are color coded and labeled). But wired this way it's impossible for me to forget to turn it off.
I'll find a better keyed power source than a wire wrapped around a fuse later. I really didn't feel like dismantling the fuse box and running the wire in from behind. But this worked in a pinch. All you need is to get power to the PTO or BCP wire, the ECM (on-board computer) does the rest automatically.