Nelson Harness took a crap on me

[RedHeartbeat]

USE2BFO bought the GM harness, see his signature for PN. I don't worry about the lights dimming for a second. That doesn't keep my truck from running. The GM circuitry is designed to turn one fan on and then 5 seconds later turns the other one on.

[Chevy366]

No , no capacitor , just a extra relay used to trip the fans on high .
Red is right I would not worry much about lights dimming but I could feel the truck actually pull down while going down the highway from the 05 fans (34"rad) cycling , that was just a little to much draw and strain on the Alternator (145 amp) , but let me say this if they are the LS1 fans (27" Rad) , there probably would not be any problems .
The factory harness has 40 amp fuses and 50 amp relays and 10 amp fuse for trigger wires (pin42,33) no lights dimming no excessive draw , can't even tell when they come on (05 fans , 34" Rad).
Will post full spread of pictures so everyone can see , but might be a couple of days .
Forgot Red has a Classic 07 for reference , but mine (fans) cycles just as a 07 factory would .
Red the harness is for all forward lights and fans , ie.... fog , head , driving etc ....

[SCIV]

So if mine is already set up for pin 42 to trigger through Allen's harness, will the factory harness be a plug-n-play?

[BlenderWizard]

<div class='quotetop'>QUOTE(use2bfo &#064; Feb 24 2007, 11&#58;57 PM) [snapback]84406[/snapback]</div>

No , no capacitor , just a extra relay used to trip the fans on high .
Red is right I would not worry much about lights dimming but I could feel the truck actually pull down while going down the highway from the 05 fans (34"rad) cycling , that was just a little to much draw and strain on the Alternator (145 amp) , but let me say this if they are the LS1 fans (27" Rad) , there probably would not be any problems .
The factory harness has 40 amp fuses and 50 amp relays and 10 amp fuse for trigger wires (pin42,33) no lights dimming no excessive draw , can&#39;t even tell when they come on (05 fans , 34" Rad).
Will post full spread of pictures so everyone can see , but might be a couple of days .
Forgot Red has a Classic 07 for reference , but mine (fans) cycles just as a 07 factory would .
Red the harness is for all forward lights and fans , ie.... fog , head , driving etc ....
[/b]

Yeah, with the ls1 fans and a 145, the only time i know they come on is at an idle. i see a momentary voltage drop from ~14.5 down to about 13. i was thinking of installing a heavier ground wire for the alt to see if that helps. Didn&#39;t I see that mentioned in another thread somewhere?

[Chevy366]

Yeah Factory harness is plug and play , pricey though .
I did see someone comment on the fact that a heaver wire was needed but I checked an 05 1/2 ton with Factory fans (145 Amp) and the ground wire gage was the same as a no-fan truck (105 Amp) .

[SCIV]

<div class='quotetop'>QUOTE(use2bfo &#064; Feb 25 2007, 02&#58;47 PM) [snapback]84442[/snapback]</div>

Yeah Factory harness is plug and play
[/b]

But do I need a different tune, or is the pin 42 that is already activated all I need? Sorry, just need a clarifiaction.
Thanks,
S.C.

[Chevy366]

<div class='quotetop'>QUOTE(SCIV &#064; Feb 25 2007, 03&#58;14 PM) [snapback]84444[/snapback]</div>

But do I need a different tune, or is the pin 42 that is already activated all I need? Sorry, just need a clarifiaction.
Thanks,
S.C.
[/b]

Not a complete re-tune just (pin 42 , 33) , your truck looks like a 05 , if you did not have fans from the factory then have someone turn on the fans .

[BlenderWizard]

I&#39;d definitely suggest getting a tune before messing around with fans.

That&#39;s like putting the carriage before the horse.

[SCIV]

<div class='quotetop'>QUOTE(use2bfo &#064; Feb 25 2007, 07&#58;08 PM) [snapback]84453[/snapback]</div>

Not a complete re-tune just (pin 42 , 33) , your truck looks like a 05 , if you did not have fans from the factory then have someone turn on the fans .
[/b]

I guess I took a stupid pill this morning, because I am not following this.

My truck is an &#39;04, with &#39;05 fans. The truck didn&#39;t come with the efans.

I have a tune from Allen now, and pin 42 is active I believe (the only way for the efans to work I think). Now I don&#39;t know about pin 33. I am guessing that I have the correct tune already in place?

Sorry for my ignorance, and for the .

[Chevy366]

<div class='quotetop'>QUOTE(SCIV &#064; Feb 26 2007, 08&#58;00 AM) [snapback]84516[/snapback]</div>

I guess I took a stupid pill this morning, because I am not following this.

My truck is an &#39;04, with &#39;05 fans. The truck didn&#39;t come with the efans.

I have a tune from Allen now, and pin 42 is active I believe (the only way for the efans to work I think). Now I don&#39;t know about pin 33. I am guessing that I have the correct tune already in place?

Sorry for my ignorance, and for the .
[/b]

You might ask Allen if he did the fans as Series Parallel</span> and enabled both sets , <span style="color:#006600">Fan 1 and Fan2 .
Fan 1 and Fan 2 are the same as pin42 and pin33 .
Hope this helps .