Fan Clutch manual switch - Dodge Cummins Diesel Forum
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post #1 of 8 (permalink) Old 06-28-2010, 10:56 AM Thread Starter
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Fan Clutch manual switch

Hello,
I just ordered a new Dorman fan clutch for my 2003. When I replace I would like to utilize a switch on the dash to engage the clutch when I want to, lice the a/c does. Has anyone done this or do you know which wire on the harness engages the clutch to lock it up? I just thought it would be nice to be able to do this without having to turn on the a/c. Any input is appreciated.
Mark


2014 Ram 2500 CC/SB/4X4/68RFE Big Horn
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post #2 of 8 (permalink) Old 06-28-2010, 08:54 PM Thread Starter
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diagram

Does anyone at least have the wire diagram for the fan harness connection??

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post #3 of 8 (permalink) Old 06-28-2010, 09:51 PM
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Man, I don't know if you can do that safely. You may fry something. But heres what I show. My program won't let me copy wire diagrams, but I'll just tell you how they are listed. All but one wire go straight to the computer. If you backprobe power to the wrong wire, you are gonna fry either the clutch or the computer...

Dark Blue is 12 volt supply from fuse 36
White is "Sens Sply". I'm assuming a 5 volt reference wire.
Orange is "Fan Spd Sens". I assume the speed sensor
Black/Light Blue is a ground shared with several other sensors.
Light Green is "Sol Ctrl"

If I had to *guess*, I would say ground the light green wire. First, check the white wire with a dvom to confirm that has 5 volts on it.

You may cook something, set a code, put the truck in limp home mode, theres no telling... Use this info at your own risk. But thats your wires
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post #4 of 8 (permalink) Old 06-28-2010, 10:36 PM Thread Starter
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Thanks!

Appreciate the info; I'll proceed with caution. But I figure if I can send the same signal as when the a/c is on, I can do it... we'll see...

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post #5 of 8 (permalink) Old 07-28-2010, 07:25 PM
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Quote:
Originally Posted by McGivern View Post
Appreciate the info; I'll proceed with caution. But I figure if I can send the same signal as when the a/c is on, I can do it... we'll see...
i was wondering if you ever got your fan clutch wired up on a switch and if so how bc i need to do this to and i have no clue how.http://www.cumminsforum.com/forum/im...onfused013.gif
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post #6 of 8 (permalink) Old 07-28-2010, 08:17 PM
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See here Fan Clutch Control Experiment for some info on this...

2003 QCLB 2500 305/555 CTD NV W/Fast Coolers 3.73 4x4, Edge CTS Evolution W/Bunch of Gauges, Donaldson DBL7349 Oil Filter, Baldwin PF7977 Fuel Filter, GDP kit W/Donaldson P551313 Fuel Filter, OEM Fan Clutch Delete
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post #7 of 8 (permalink) Old 07-28-2010, 11:19 PM
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I apologize guys, I still haven't made any progress on cutting the delay time down, I'm still tweakin on it though..

03 2500, 6 spd, 4x4, leveled, 315-70R-17's, BHAF, A-1 studs, Hamilton 181/210, SMARTY, Amsoil bypass,ATS exh man., Fluidampr, Airdog, 09 steering, KC's on top, DDP 50HP Inj's, Garrett Stg 2, Jake Brake, OASIS XD4000, 10 gals of tanks, shocker XL's
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post #8 of 8 (permalink) Old 08-07-2010, 02:33 AM
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on my 05 i was wondering if the wire is brown and orange bc the guy that hooked mine up tapped in to that wire right at the computer but it is causein my truck to die when i flip the switch off sometimes and it is throwing these codes, p0480

p0483, p2509 so if you know any thing please help
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