For the brake switch cruise integration, you might also be able to use something like a G-body brake switch. The purple wire is inverse of the brake light wire.
Good to know the G Body has that version of the switch. I usually use the early-mid 2000's GM switch that came on all the econobox cars. It has both outputs also and an adjustable threaded section making it sorta universal.
Will, enjoy watching your content. I did an ls swap in an old bump side ford and everything is running well. I’m trying to get cruise working (2003 4.8 from a Silverado-stock pcm, harness, TAC module, and pedal). I have hp tuners and I get an “on-off” signal, a set signal, and a resume signal, but still can’t seem to get it to go “active -at Highway speed of course”. Could I be missing something minor? PS, I do have +12v going to P33 on the computer as well…same as your relay from the brake light switch, and I’ve confirmed there’s power there. Sorry for the lengthy comment and thanks in advance for any suggestions!
My first guess would be to check that the TCC is wired/working and also both of the brake switches. There's two brake pedal signals that go to the PCM, one for brake on and one for brake off. The PCM needs to confirm all 3 conditions before allowing the cruise to engange. If all 3 of those are good, sometimes you need a +10v brake on signal, not +12v. You can wire a resistor inline, it's usually only an issue with LED brake lights that don't draw enough amps to lower the voltage a little.
I had to follow up just to say thanks again. The resistor on the chmsl wire did the trick. What I’ve learned from watching your videos makes me look like a genius to everyone around here. 😂 Keep up the good work man, you should have thousands of followers!!
I'm stuck. I did the LS swap into my 61 Pontiac. Used the original 2004 Silverado harness , fuse box, TAC module and Cruise switch. My cruise doesn't work. I supplied keyed power directly to the switch. (used the O2 sensor downstream circuit)(It had been powered by the Silverado under dash fuse box) I checked It at the C100 connector. The switch functions properly ...tested all four wires for power when key is on and when pressed, etc .. I wired purple C1 C12 TCC signal wire to the dual function brake switch with power on when pedal is not depressed. That was tested and works. Do I also have to connect the C3 A5 purple TCC Brake / signal wire to the brake switch? Scratching my head. What am I missing?
Great info. So is the c100 part of the engine harness? Or does it go thru the c1 block? I'm in the middle of pulling everthing from a donor yukon. Just want to make sure I'm getting everything I need and have cruise. Thanx for your video and time.
I did the LS swap into my 61 Pontiac. Used the original 2004 Silverado harness , fuse box, TAC module and Cruise switch. My cruise doesn't work. I supplied keyed power directly to the switch. (used the O2 sensor downstream circuit)(it had been powered from the Silverado under dash fuse box) I checked It at the C100 connector. The switch functions properly ...tested all four wires for power when keyed on and pressed, etc .. I wired purple C1 C12 TCC signal wire to the dual function brake switch with power on when pedal is not depressed. That was tested and works. Do I also have to connect the C3 A5 purple TCC Brake / signal wire to the brake switch? I'm puzzled. What did I miss?
The computer needs to know: brake on, brake off, and the TCC wiring connected and working. Somewhere I have a video that covers the TCC switch wires also, should be earlier then this one was. The easiest way to test them is by watching the live data from the computer. I showed my checks around @6:02. If you don't have a way to watch the live data with a scan tool, it's time to make a friend with someone who can lol. There's also a minimum speed requirement in the computer for cruise to function, Stock is around 30MPH or so if I remember correctly.
@@wilsworkshop so it needs three different wires? one for each signal? .. brake on, brake off, and the TCC ? Do you know which wires those are? I know I have the TCC wire connected and functioning. I just assumed the single TCC wire provided that information.
There could be a couple things, the wiring from the cruise controls could be different then the one I showed(NC vs NO or variable resistance). The other thing is there's at least 1 "safety" I know of internal to the computer where the cruise won't engage if the brake pedal signals aren't correct (there's a +12v for pedal pressed, and a +12v for pedal not pressed), could be something along those lines. It's hard to diagnose wiring without seeing it.
Hey Wil, good stuff. Question, does the c100 connections supply the 12 volts when the cruise stick buttons are pressed, or does it supply the path to ground? I'm going to put a couple momentary switches and an off/on switch in a box versus using the cruise stick and just am wondering what supplies the power. Kinda like the MIL light hook up where I put power to one side of the light, and the pcm provides the path to ground when a fault triggers it.
Well, all the wires are connected well, but I can’t adjust the speed. Does the computer programming have anything to do with the lack of speed control (note that the car does not have an ABS, it is Caprice 1986)
I don't remember the pin numbers off the top of my head, but here's a great source for all the wiring schematics and pin numbers: www.lt1swap.com/2000harness.htm
Yep, DBC can be done also, it's just a little more work. You have a couple options: Aftermarket cruse control box or get the stock LS truck cruse control box and wire it all in.
@@wilsworkshop i a yousing tja holley terminator do you have a phone number I don’t care if you charge me for the info because I want too youse mi orignal shifter that has the truck 1990 silverado truck
Up behind the drivers head light, flat against the core support, if that makes sense. It's nearly invisible when the hoods open (painted it black to match the engine bay), but easy access if I need to pull it out.
Cat was a stray I fed and let sleep in the shop while trying to find a home for him, last week he moved on to his next great adventure. I miss him, but he was never really mine, it was just my turn. I might drag Dog or Chicken out to the shop as a special guest. I guarantee you've never seen a Chicken assist with an engine swap !
Amazed you don't have more views. There's a lot of swap-related stuff on here I haven't seen in detail before. Thanks!
More to come!
For the brake switch cruise integration, you might also be able to use something like a G-body brake switch. The purple wire is inverse of the brake light wire.
Good to know the G Body has that version of the switch. I usually use the early-mid 2000's GM switch that came on all the econobox cars. It has both outputs also and an adjustable threaded section making it sorta universal.
The fuel gauge on my 94 5.3 swap does the same exact thing. Reads correctly sitting still but bounces some going down the road.
great video but you didn't show where to plug that into. When you say you plugged it into the harness you didn't say were????
Will, enjoy watching your content.
I did an ls swap in an old bump side ford and everything is running well. I’m trying to get cruise working (2003 4.8 from a Silverado-stock pcm, harness, TAC module, and pedal).
I have hp tuners and I get an “on-off” signal, a set signal, and a resume signal, but still can’t seem to get it to go “active -at Highway speed of course”. Could I be missing something minor?
PS, I do have +12v going to P33 on the computer as well…same as your relay from the brake light switch, and I’ve confirmed there’s power there.
Sorry for the lengthy comment and thanks in advance for any suggestions!
My first guess would be to check that the TCC is wired/working and also both of the brake switches. There's two brake pedal signals that go to the PCM, one for brake on and one for brake off. The PCM needs to confirm all 3 conditions before allowing the cruise to engange. If all 3 of those are good, sometimes you need a +10v brake on signal, not +12v. You can wire a resistor inline, it's usually only an issue with LED brake lights that don't draw enough amps to lower the voltage a little.
I had to follow up just to say thanks again. The resistor on the chmsl wire did the trick.
What I’ve learned from watching your videos makes me look like a genius to everyone around here. 😂
Keep up the good work man, you should have thousands of followers!!
Excellent video. As good as it gets.
Glad you enjoyed it!
I'm stuck.
I did the LS swap into my 61 Pontiac. Used the original 2004 Silverado harness , fuse box, TAC module and Cruise switch. My cruise doesn't work. I supplied keyed power directly to the switch. (used the O2 sensor downstream circuit)(It had been powered by the Silverado under dash fuse box) I checked It at the C100 connector. The switch functions properly ...tested all four wires for power when key is on and when pressed, etc .. I wired purple C1 C12 TCC signal wire to the dual function brake switch with power on when pedal is not depressed. That was tested and works. Do I also have to connect the C3 A5 purple TCC Brake / signal wire to the brake switch? Scratching my head. What am I missing?
so, the Lt blue wire from c-2 A10 is connected directly to 12 v batt with a fuse or it can be connected to Ignition key?
Great info. So is the c100 part of the engine harness? Or does it go thru the c1 block? I'm in the middle of pulling everthing from a donor yukon. Just want to make sure I'm getting everything I need and have cruise. Thanx for your video and time.
It's part of the harness. If you get the whole un-cut harness you'll be all set.
I did the LS swap into my 61 Pontiac. Used the original 2004 Silverado harness , fuse box, TAC module and Cruise switch. My cruise doesn't work. I supplied keyed power directly to the switch. (used the O2 sensor downstream circuit)(it had been powered from the Silverado under dash fuse box) I checked It at the C100 connector. The switch functions properly ...tested all four wires for power when keyed on and pressed, etc .. I wired purple C1 C12 TCC signal wire to the dual function brake switch with power on when pedal is not depressed. That was tested and works. Do I also have to connect the C3 A5 purple TCC Brake / signal wire to the brake switch? I'm puzzled. What did I miss?
The computer needs to know: brake on, brake off, and the TCC wiring connected and working. Somewhere I have a video that covers the TCC switch wires also, should be earlier then this one was. The easiest way to test them is by watching the live data from the computer. I showed my checks around @6:02. If you don't have a way to watch the live data with a scan tool, it's time to make a friend with someone who can lol. There's also a minimum speed requirement in the computer for cruise to function, Stock is around 30MPH or so if I remember correctly.
@@wilsworkshop so it needs three different wires? one for each signal? .. brake on, brake off, and the TCC ? Do you know which wires those are? I know I have the TCC wire connected and functioning. I just assumed the single TCC wire provided that information.
Hey man so I have mine all wired up. In HPT it's saying cruise is on, cruise Is set but it's not saying cruise I'd active and I can't get it to engage
There could be a couple things, the wiring from the cruise controls could be different then the one I showed(NC vs NO or variable resistance). The other thing is there's at least 1 "safety" I know of internal to the computer where the cruise won't engage if the brake pedal signals aren't correct (there's a +12v for pedal pressed, and a +12v for pedal not pressed), could be something along those lines. It's hard to diagnose wiring without seeing it.
Hey Wil, good stuff. Question, does the c100 connections supply the 12 volts when the cruise stick buttons are pressed, or does it supply the path to ground? I'm going to put a couple momentary switches and an off/on switch in a box versus using the cruise stick and just am wondering what supplies the power. Kinda like the MIL light hook up where I put power to one side of the light, and the pcm provides the path to ground when a fault triggers it.
N/M, I looked at lt1swap diagrams and it looks like the c100 will provide the power and I just supply a path to ground when the buttons are pressed.
what cover did you use for the fuse block ?
Does ABS have anything to do with the cruise control?
It depends on the wiring setup I suppose. For this installation I don't have the ABS wired to the computer, so it's not a factor.
Well, all the wires are connected well, but I can’t adjust the speed. Does the computer programming have anything to do with the lack of speed control (note that the car does not have an ABS, it is Caprice 1986)
@@wilsworkshop (12 volts for the depressed pedal, + 12 volts for the depressed pedal) What is its number in the PCM?
I don't remember the pin numbers off the top of my head, but here's a great source for all the wiring schematics and pin numbers: www.lt1swap.com/2000harness.htm
Do you think a can make it work if i use it on a drive by cable throttle bodie?
Yep, DBC can be done also, it's just a little more work. You have a couple options: Aftermarket cruse control box or get the stock LS truck cruse control box and wire it all in.
@@wilsworkshop i a yousing tja holley terminator do you have a phone number I don’t care if you charge me for the info because I want too youse mi orignal shifter that has the truck 1990 silverado truck
For a Holley setup, you'll need to ask Holley how to wire it up (if it's even possible). The video is just for the stock GM computer.
Where did you finally mount your PCM?
Up behind the drivers head light, flat against the core support, if that makes sense. It's nearly invisible when the hoods open (painted it black to match the engine bay), but easy access if I need to pull it out.
What, no cat cameo?
Cat was a stray I fed and let sleep in the shop while trying to find a home for him, last week he moved on to his next great adventure. I miss him, but he was never really mine, it was just my turn. I might drag Dog or Chicken out to the shop as a special guest. I guarantee you've never seen a Chicken assist with an engine swap !