LS factory cruise control hook up

[awhite4557]

In reference to post #2, LED lights, you can use LED lights with these cruise controls using a relay to allow the cruise to find the ground. Here is the diagram. I used it on my truck and it worked. Hope this helps. (my truck is DBW but this should still work).

[ls1nova71]

Originally Posted by awhite4557

In reference to post #2, LED lights, you can use LED lights with these cruise controls using a relay to allow the cruise to find the ground. Here is the diagram. I used it on my truck and it worked. Hope this helps. (my truck is DBW but this should still work).

You are corrrect. I didn't mention it because relays have the ability to confuse the heck out of some people. On this set up, if you were only using the relay for a load, you could just tap it into the brake light wiring, in either the right or left brake light, it doesnt matter you only need one, and just use the 85 and 86 terminals of the relay, the module would see ground with enough resistance through the relay coil. If someone wants me to draw a diagram i will, just let me know.

lMy personal car doesn't have the brake switch I showed, it has the switch under the floor, and you can only find single switches, so I used that with a relay to control the TCC, and the cruise is tapped into that. But I think if you're unsure of your wiring abilities its best to keep it simple. BTW, nice diagram, I wish I knew how to draw stuff on the computer but I don't so you all get my hand drawn diagrams.
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[TA_C10]

Originally Posted by ls1nova71

You are corrrect. I didn't mention it because relays have the ability to confuse the heck out of some people. On this set up, if you were only using the relay for a load, you could just tap it into the brake light wiring, in either the right or left brake light, it doesnt matter you only need one, and just use the 85 and 86 terminals of the relay, the module would see ground with enough resistance through the relay coil. If someone wants me to draw a diagram i will, just let me know.

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I just want to clarify post #9 in this thread in case someone else comes along like I did. I created all my own diagrams before I installed my new wiring harness and when you get into the details you need to know exactly how this works.

So cruise control(dbw or cable box), LED lights, and a relay. What ls1nova71 means exactly here is that you take the brake switch wire(from the inside of cab, white wire off switch) or either left or right brake light wire outside of cab, and splice into that, one end of the wire attached to relay 85 pin, the other end of the wire attached to relay 86 pin. You DO NOT GROUND the relay. You are only using the relay coil inside the relay like it's a "resistor".

Someone like me who needed that detail, might benefit from this post.

EDIT: See posts below, I was wrong....


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[ls1nova71]

Originally Posted by TA_C10

So cruise control(dbw or cable box), LED lights, and a relay. What ls1nova71 means exactly here is that you take the brake switch wire(from the inside of cab, white wire off switch) or either left or right brake light wire outside of cab, and splice into that, one end of the wire attached to relay 85 pin, the other end of the wire attached to relay 86 pin. You DO NOT GROUND the relay. You are only using the relay coil inside the relay like it's a "resistor".

This is not exactly what I meant. I suppose you could wire it this way, however, by splicing the relay in as you describe, you are putting it in series rather than parallel in which case you would be losing some voltage to the brake lights. This may not be noticable on LED brake lights though, but I would recommend just tapping off the brake switch wire and grounding the other side of the relay so you have the full 12v going to the brake lights.

[TA_C10]

Oh, so you DO ground the other side of the relay? Ok, that is how I have it now and I thought I had it wrong after re-reading your post and the wording you used. I'm no wiring expert so I sometime need things explained to me like I am a 3 yr old....

I have the American Autowire harness so I used the 3rd brake light wire(blue) that is tapped into the white wire already on the brake switch connections.





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