Help identify wire/hose under hood...

[digitalepiphany]

This is in an '84 K5. Kain also has the same thing in his. We're both wondering what the hell they go to.

First pic is the hose and wire. Second pic is where they go through the firewall.

 

[dyeager535]

Without going and looking at mine, I'm guessing cruise. And if I'm right, makes me wonder why people pull it. Those wires and hose loomed up nice and clean, throttle cable, and a vacuum motor. So much clutter.

 

[digitalepiphany]

Not sure why we didn't think of that. We did notice that all the CC stuff was missing from my K5, so we should've thought of that.

Regardless, once I decide to add CC back, I'm thinking of switching to the electronic version like LMC sells.

 

[sweetk30]

vac hose to kill cruise when brakes hit .

and wire is for cruise .

 

[dyeager535]

I don't know what LMC is selling, but GM converted to electric cruise in the early 90's on pretty much everything, and at least for some variants, is a "bolt on" for our trucks, using the same cruise stalk as ours. I believe the cruise module was integrated with the electric cruise box. Pretty sure every GM vehicle with cruise at one point got that style of cruise module. As far as I could tell, the cable length was the main variable.

One of these days I'd like to do that swap, need to get one (or a few) before they become hard to find.

 

[digitalepiphany]

I looked back through LMC's catalog, and I must've been smoking something, 'cause they don't sell anything for cruise control other than the turn signal lever.

 

[Kain]

http://www.sears.com/rostra-250-122...-SPM9930657220?prdNo=2&blockNo=2&blockType=G2

 

[digitalepiphany]

What're you doing up so early?

 

[Kain]

My alien went off...

 

[digitalepiphany]

Gotcha.

 

[dyeager535]

Looks like it needs 2X what the older trucks push for VSS: http://www.fieros.de/en/articles/digcruise.html

Here is a conversion in one of our trucks, but diesel: http://www.dieselplace.com/forum/63...876-electronic-cruise-control-conversion.html

 

[digitalepiphany]

Does VSS stand for Vacuum Switch Solenoid? If so, what do you mean by, "it needs 2X what the older trucks push for VSS?"

If not, what is it?

 

[thatK30guy]

Vehicle Speed Sensor

 

[digitalepiphany]

Google wasn't my friend on that one.

 

[dyeager535]

FWIW the 4K and 2K are the same signal, just twice as much for the same vehicle speed. I assume the 4K gives cruise better resolution to keep throttle/speed movements smoother. So it's not like you CAN'T run the 4K with 2K or 2K with 4K, but there is a 25MPH minimum set in the way the cruise module is designed (at least on the older ones like ours) so if the later ones are setup the same way, you'd either get cruise to work at 12.5MPH and up (no idea if there is a max speed programmed in, never tried) or at 50MPH and up. The latter would suck IMO. At least in my case, I've got plenty of 35 and 45MPH roads that I use cruise on to keep myself out of trouble.

Easy fix probably exists from jagsthatrun.com, they likely sell a 4K signal generator that goes inline with the speedometer cable. But it is more money. Another reason to convert to DRAC/90-91 RV cluster/241 lol.

 

[digitalepiphany]

When I do get around to replacing the cruise control system, I'd like it be as close to a bolt-in job as possible. I can splice and solder wires, but soldering wires to circuit boards is something I've never done (I'm sure some practice would take care of that, but still...)

What solution would you guys suggest that's closest to bolt-on (AKA easier)?

 

[dyeager535]

Warning: This is a good VSS primer, but has at least one inaccuracy about trucks (always want VSS/speedometer cable on transfer output, duh) http://www.jagsthatrun.com/V8-chapters/V8-tpi-Speed-Sensors.pdf

From what it looks like, there is no 4K that will simply replace the 2K setup the older trucks have.

This is not really cheap, nor easy (well, IMO it is) but as far as I can tell from what I see/know is available, the bolt in solution is a '90/91 R/V NP241 (no speedo cable), '90/91 R/V cluster to match, and run it that way. 241 can be had for $100 if you keep your eyes open, cluster is worth maybe $35, DRAC can be had cheap, etc. Lot of money to get better cruise, but then again, the lack of speedometer cable is a benefit, as is being able to make speedometer corrections for tire/gear changes with VERY simple soldering.

That, of course, if the later cruise module 4K signal is square wave. I can't imagine GM would have made our lives easier and had that cruise module accept the 4K output sine wave the signal generators that ARE available, output.

 

[digitalepiphany]

I'll read this tomorrow after I've had some sleep, and respond accordingly.
Thanks.