Mark VIII fan + BB Harness

[sparg93]

Has anyone on this site utilized the BB harness with their Mark VIII fan?

What modifications did you have to make to plug the system together?

THanks!

 

[sparg93]

anybody??

 

[AtomicHoe094]

noppeee

 

[sparg93]

ttt - c'mon...who out there customized their harness??

I'll buy you a 6pack if can give me an idea of how I have to customize this thing!

 

[AtomicHoe094]

Why do you need the BB harness?? i thought that would only work on the NBS trucks??
Just grab a flexlite computer and be done..

 

[sparg93]

i had justin program my computer to turn on the fans...now i just to figure out how to wire the whole damn thing up.

 

[AtomicHoe094]

whats this harness look like? it cant be too bad. Power, ground, probe, etcetc

 

[sparg93]

The two connectors with orange bands I believe are for the plug-n-play LS1 fan...i have a Mark VIII so i won't be using them. Unless they have some other use?

Green = AC Tap
Blue = (not sure...it's a thin metal pin)
Terminal ends = positive and negative terminals

I'm pretty sure i can figure out who to wire it hot and ground it


My question(s):
I'm not sure what to do with the blue pin...does it go into the PCM? Where?

Where should i splice in the green AC wire?

This is going to be a stupid question, but I have two negative terminals and one positive. What is the reason for that?

 

[AtomicHoe094]

Im still curious to why you bought that harness... when i pull it up online its not saying anything about your vehicle year. 99 was the year they switched to the nbs silverados and seirras, not Tahoes and yukons. hence engines and pcms are different.

Im pretty sure that harness will do nothing for you.

We sell electrical harnesses and alternator overdrive pulleys for 99-06 trucks and SUVs that allow you to control a set of electric cooling fans via the PCM. By removing the clutch-driven fan, you're able to free up some horsepower and improve the engine's efficiency by only running the fans when necessary.

I think you need to talk to jenna or Justin about this. Id grab one of those Flexalite controllers in the meantime, those are simply, easy and badass

 

[sparg93]

Justin told me you can modify it to fit my OBS Vortec...at least one person on this forum completed the mod...

Now i'm just trying to find that person

I think if i can figure what to do with the blue wire (thin metal pin at the end), I can figure this out. I'm assuming this pin is inserted somewhere in/near the computer.

 

[AtomicHoe094]

ive seen people tap off of wires for the computer, but ive never seen anything spaded into the computer.. hmm :/

 

[sparg93]

maybe just jam it in there and hope for the best? (kidding)

---------- Post added at 11:08 PM ---------- Previous post was at 10:42 PM ----------

http://www.ls1truck.com/forums/electrical/183-need-help-fans-pcm.html

at least this gives me an idea of where to start looking for the Blue42 wire! Now it's just figuring out how to wire in my fan for "high" vs "low" but i can probably just wire in the "high" wire from my fan (it's a two speed).

I'm still thinking about the AC wire....i'm thinking there is an AC wire that runs from the dashboard to the computer and there is a way to tap in it from there.

Anyone have any ideas??

Atomic - i will resist the flexalite controller as long as possible, I will make this work!!!

 

[AtomicHoe094]

the green wire you speak of. on the TBI motors, it was just coming right off the compressor, thats what flexalite wanted you to tap off of.. I never ended up using the green wire for my kit since i dont use my air.. it was pointless

 

[Monstar_est87]

Hey let me butt in for a second... Wat year is the mark VII fan out of..?

 

[sparg93]

Not sure - this is the one I purchased; 2speed 18"

http://cgi.ebay.com/ebaymotors/ws/e...0770105741&viewitem=&sspagename=STRK:MEWNX:IT

 

[99Yuk]

If I had to guess, Justin programmed the Aux fan to be your fan controller by readjusting the temps and conditions that it comes on at.

It would be the dark blue wire if he did;

Maybe a quick email to him would confirm.
As for the harness? IDK...

Just my $0.02...

 

[sparg93]

Yuk!! I feel like i haven't seen you on here in a few weeks!! (i'm almost ready to start ordering my hydro parts)

Yeah, I sent him an email but he was tuning over the wkd so there is a bit of a delay.

Any idea how to tap that Blue42 wire (thin metal pin at the end) into the computer or computer wires?

 

[99Yuk]

Yuk!! I feel like i haven't seen you on here in a few weeks!! (i'm almost ready to start ordering my hydro parts)

Yeah, I sent him an email but he was tuning over the wkd so there is a bit of a delay.

Any idea how to tap that Blue42 wire (thin metal pin at the end) into the computer or computer wires?

I was gone further up North for a week or so with no i-net access.


I had a couple of thoughts on how I would do this if it was my project.
If your interested, here they are;

1) I have not confirmed this, but I think that some of our trucks (the 2500's and Suburbans) have an aux efan in front of the ac rad which blows on the entire rad section from the front. I would imagine (again not confirmed) that our trucks would have this wiring harness in place even though we may not have the factory fan. I would go look for it and if you found it, wire up that harness on/off lead to that and see if that's where Justin put the fan controls. It's the most logical place to put it.

2) If you can't find that aux fan harness, then I would pull back the wire loom on the computer and look for the dark blue wire. If there's more than one, uh-oh. If only one, then hook up that harness on/off lead to it and again see what happens.


GL!