LS factory cruise control hook up

[chevydog66]

Hooked mine up on my 72 GMC with 01 6.0 dbc but its not working. I have led taillights. What do I need to check ?
Posted via Mobile Device

[ls1nova71]

Originally Posted by chevydog66

Hooked mine up on my 72 GMC with 01 6.0 dbc but its not working. I have led taillights. What do I need to check ?
Posted via Mobile Device

You need to put some sort of load on the circuit. On the brake switch there is an orange wire and a white wire. The orange is constant hot, the white gets power when the brakes are applied. Try hooking a light bulb on the white wire with the other side grounded and see if it works. The light will come on when the brakes are applied if you hook it up right. The bulb needs to be something like an 1157 or close, a peanut bulb like in the dash won't cut it.
Posted via Mobile Device

[chevydog66]

I have power at pink and purple. Am I supposed to have any power at vss out or K on module?
Posted via Mobile Device

[chevydog66]

Hooked a 2k resistor in there and now it works. Thx.
Posted via Mobile Device

[dkauffman05]

I just swapped in a 6.0 in a 86 k10 with a 700r4 Mabee I missed something but can this work with a 700 r4 with a psi harness? I have the cruse box that would mount on the firewall of a 99-02 truck. My swap is also drive by cable.
Posted via Mobile Device

[ls1nova71]

Originally Posted by dkauffman05

I just swapped in a 6.0 in a 86 k10 with a 700r4 Mabee I missed something but can this work with a 700 r4 with a psi harness? I have the cruse box that would mount on the firewall of a 99-02 truck. My swap is also drive by cable.
Posted via Mobile Device

Maybe. What are you doing for a speed sensor (VSS)?

[dkauffman05]

Well it's an 86 so it has a cable speedo. So I'm assuming unless I get some aftermarket converter to get a vss output it's a no go?
Posted via Mobile Device

[ls1nova71]

Originally Posted by dkauffman05

Well it's an 86 so it has a cable speedo. So I'm assuming unless I get some aftermarket converter to get a vss output it's a no go?
Posted via Mobile Device

Yes, I'm afraid so. You need some kind of speed sensor to get a signal for it to work.

[Hart_Rod]

Originally Posted by dkauffman05

Well it's an 86 so it has a cable speedo. So I'm assuming unless I get some aftermarket converter to get a vss output it's a no go?
Posted via Mobile Device

Originally Posted by ls1nova71

Yes, I'm afraid so. You need some kind of speed sensor to get a signal for it to work.

This would probably work:

http://www.dakotadigital.com/index.c...rod/prd109.htm

[chevydog66]

Speartech labeled a yellow wire for my speedo output. I spliced into that on mine.
Posted via Mobile Device

[Daaaanz67]

Yoooooou caaaaaaan doooooooo itttttttttttt!!!!!!!!!!!

[socorob]

This was a great writeup, thank you so much. I have a question about using rocker/toggle/pushbutton switches instead of the GM stalk. My LS is going into a Datsun so I don't have a place to mount a stalk.I drew a photo of the wiring diagram I think is correct. Could someone verify it please? Thanks!

[ls1nova71]

Originally Posted by socorob

. Could someone verify it please? Thanks!

That looks correct to me. Nice drawing by the way!

[socorob]

Forgot to attach the drawing. Sorry for it being so sloppy, I just did it quickly.

[socorob]

Thanks! Couldn't have done it without you. Now to start wiring.

[socorob]

I may have missed it, but what size fuse did GM use on the cruise control circuit?

[ls1nova71]

Originally Posted by socorob

I may have missed it, but what size fuse did GM use on the cruise control circuit?

I probably should have included this info in the first post. If I can figure out how, I will go back and edit it. But to answer your question, there should be two 10 amp fuses, one on the wire going to D and one on the wire going to G on the cruise module.

[JJH Jimmy]

Originally Posted by ls1nova71

I probably should have included this info in the first post. If I can figure out how, I will go back and edit it. But to answer your question, there should be two 10 amp fuses, one on the wire going to D and one on the wire going to G on the cruise module.

ls1nova, what fuses should be used on a DBW application and where should they go? Thanks.

[solidaxel]

Originally Posted by JJH Jimmy

ls1nova, what fuses should be used on a DBW application and where should they go? Thanks.

Thanks, I need to follow that one as mine is a piece together rocker style on- off switch and push button stalk only with DBW 2003 5.3

[ls1nova71]

Originally Posted by JJH Jimmy

ls1nova, what fuses should be used on a DBW application and where should they go? Thanks.

10 amp fuse on the wire powering up the switches. The light blue wire going to pin C1-6 on the TAC module is also fused with a 15 amp fuse, but since you will be tapping power off your brake switch, it would already be fused through the original brake light fuse, so you don't need to add another one.

[socorob]

Would this be correct?

[JJH Jimmy]

Originally Posted by ls1nova71

10 amp fuse on the wire powering up the switches. The light blue wire going to pin C1-6 on the TAC module is also fused with a 15 amp fuse, but since you will be tapping power off your brake switch, it would already be fused through the original brake light fuse, so you don't need to add another one.

Thank you!

[socorob]

Thanks, I just thought you were being redundant for extra protection.

[1965Impala]

ls1nova71, in your hand drawn diagram in your first post, you indicate that the "J" is not necessary for the cruise to work. Does that mean it is optional or that it should not be connected? Just out of curisosity, what does the "cruise engagment signal" do? I assume that it is the Cruise Module telling the PCM that the cruise is engaged, but what is the PCM doing with that information? Thanks for all of the great information.

[ls1nova71]

Originally Posted by 1965Impala

ls1nova71, in your hand drawn diagram in your first post, you indicate that the "J" is not necessary for the cruise to work. Does that mean it is optional or that it should not be connected? Just out of curisosity, what does the "cruise engagment signal" do? I assume that it is the Cruise Module telling the PCM that the cruise is engaged, but what is the PCM doing with that information? Thanks for all of the great information.

I've heard that there are different shift tables for when the cruise is engaged, however, I hooked that wire up on both my truck and my car, and couldn't tell any difference what so ever. I suspect it also sends a signal to the instrument cluster, which is a module it's self, and is what will disengage the cruise when the shift lever is moved into neutral while driving with the cruise on. I have the factory 5.3 NSS mounted on the transmission, and all the wires are hooked up, and it does not disengage when shifted into neutral. Not a big deal since it seems totally unnatural to do that anyway, but I've tested it and it's the same on both of my cars, it will rev until it hits the rev limiter if you don't shut it down first. Also, as far as I know, all aftermarket cruise controls will do the same thing.