DO WHAT?! - Identifying ORIGINAL Firewall Wires For LS SWAP - UTX 

This is the best information on the LS swaps hands down!

I found you because I decided to do an 86 K20, found a 5.3 LS. Now I'm soaking up all the knowledge you'll give me. I appreciate you.

This applies for a 77-79 caprice also. Purple is starter signal, pink for hei coil will be your pcm switched power, both reds I put to the starter power lug where the battery cable goes. Wire your fuel pump and it’ll fire no problem

Just what I needed to see, I have a 87 r10 and didn’t know which wires I’m supposed to be using. Thanks for the help.

This is to funny. Literally in the middle of removing a 4.8 & 4l60 for a 77 c10. Doing your method of keeping the original LS coolant bottle and fuse block in the swap just like you have done there. Awesome videos.

Finally! I am now "in the know". Thanks for taking the time to do this deep dive. I never understood that whole ignition resistor thing...until now.

Another informative video. I enjoy learning new things, and I'm actually learning a lot. Thanks ya'll

Although, Im aware of which wire goes where in a LS swap, I wish you had ended the video where you would connect each of those red and pink wires to the LS harness/relay, etc. That would have clarified any ambiguity from testing between wires of the same color. Otherwise, love the channel and content, look forward to each video.

Best Bulk head wiring video I have seen.

Another great video this is how I tested my s10 swap after your help on the wiring thanks again.

Huh? I thought I knew a little bit but now I know I don't. Thanks.

Nice one! Keep em comin'.

I'm in the planning stages of building a 89 Bronco II, it's going to be a offroad buggy only. I have decided that I'm going to LS Swap it. I was first thinking 5.3, but now I'm starting to think 6.0. Thanks for all the info you guys are providing!!! Much help!!!!

Love your channel

Night School with Jerry and special guest Emily. Everything Chevrolet to start your day....OK? For extra credit you are invited to participate in an electroshock therapy trial... on a strictly volunteer basis... Yeah. Thanks for sharing. Stay warm 🐲

You should make Jerry wear his professor jacket when he's at the whiteboard. I think he enjoys it as much as we do

Much better and easier way to test for these things is to simply use a test light - with an incandescent bulb. I cannot stress how IMPORTANT it is that it has an incandescent bulb. Test lights with LEDs? Throw them away, they're useless. For example, the wires you were concerned with applying +12v to? Simply use a test light connected to +12v. If the bulb lights brightly, it's a straight path to ground. If it lights dimly, it's in circuit with something to ground. The bulb acts as a fuse also, and will blow if you somehow make a big mistake (protecting the circuit), but will generally just light normally if you're connected to ground. You can also connect the light to ground and test for positives. The incandescent bulb will also give a much more... "real world" reading than a voltmeter. A test lamp's incandescent bulb will put an actual load on the circuit, and won't light brightly if there's a significant resistance or poor connection in the circuit... where a voltmeter might read a perfect 12v despite such a problem with the circuit. They're just more versatile tools in general.

Nice shirt Jerry!

Great video as always! I have a question. I am doing a 6.2 Manual in a 79 C10. I have a standalone harness for engine. This truck did not have relays like newer ones do. Do i need to run starter through a relay? Thank you!

I need your next video please on accessories. Literally were I’m stuck at right now. On 86 c10 myself. And how to test them as well.

I've recently found your videos and am enjoying them very much. I live fairly close to you, I'm north of Springfield. I'm just wondering if you only do these swaps on trucks? I have an 83 trans am I'm wanting a 5.3 and a 4l60 put into. I'd like to talk to you about if you would be interested in doing this swap for me.

Do you ever use any aftermarket wire harnesses? Would those be easier for more novice installers?

Question, I rewound the video and there were four wires laying on the fuse box in the beginning of the video. In my vehicle, I found three wires, pink purple and red. None of the other wires seem to be large enough. How do I locate the other large wire? For reference my vehicle is a 72 K5 that has been rewired by a previous owner...then it caught fire, a small fire, so I bought it cheap.

Where did you guys go to to buy your wiring diagram?

Question. Putting an LS in a 1961 Pontiac with generator wiring. Obviously I am eliminating the original generator and voltage regulator. There is a large yellow wire at the horn relay junction post from the battery fed by a large red wire. Another heavy wire went from there to the original starter. That yellow wire goes into the fire wall directly to the amp gauge. Then a red wire comes off the other side of the amp gauge and splices into several red branches the under dash harness feeding everything under the dash, and also comes back to the voltage regulator on the outside of the fire wall. I am thinking the I can eliminate the red wire that comes back out to the voltage regulator from the place where it branches from the rest of the red wires to under dash. And I can feed power from the LS fuse box to the Yellow wire that goes to the amp gauge . There are several possible locations to do this from. an ABS 60 fused plug on the underside and a couple 50 fused plugs also on the underside. Or there are two posts on the corners of the fuse box that I could use and possibly put a 50 or 60 amp fuse into one of those. Do I have the right idea? Any recommendations? Will my amp gauge work still? Then All I need to do is connect my purple ignition starter wire to the C1 -A3 terminal, and my ignition on wire to the C1 - A9 position. Correct? I will also eliminate the old coil wires from the ignition switch that you mentioned in the video, correct?

Electron flow is negative to positive. Voltage flow = positive to negative

hello 👋

The drivers door hinge need WD-40!

Wow all the filler sounds do you forget what your about to say before ya say it!?