Pwm fan in 4th gen

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crazykid1994

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Location
Florida
Ram Year
2017
Engine
Hemi 5.7
Here’s my official write up. This write up is for a 2015-2017 as I have not been able to confirm the wiring or canbus signal is the same on other 4th gens. When you order the module you must specifically tell them it is for a ram truck. It will operate the 4th gen pentastar fan as well. They both share the same blade design but I believe the 5th gen fan motor is a higher wattage. This is not the heavy tow package fan or ecodiesel fan. Those are not a confirmed fit. You will need some automotive wiring, zip ties, solder or wire taps (soldering is recommended for a solid connection), electrical tape, and some heat shrink butt splices to extend the wires as needed.
Pwm module
Fan harness

Fan harness wires directly to the battery. Has an inline fuse already.
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I installed the pwm module behind the radio and ran the canbus wires down into the passenger footwell to the star canbus. I soldered the connection on mine.
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Your brown with white tracer is the can high from the pcm and the paired yellow will be your can low.
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For power to the module I used a fuse tap from fuse 78 which is the ecm fuse and used the ground connection right next to the battery. You have to use the ecm fuse slot as that is the only fuse slot in the tipm that is powered on with the engine. If you use the accessory fuse slot it does not energize with engine on, it is a key on powered slot which will not work with remote start. I already have a grommet through my firewall from a previous project using the clutch hole plate. You will also need to run the pwm signal wire through the grommet as well.
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crazykid1994

crazykid1994

Senior Member
Joined
Sep 21, 2013
Posts
5,040
Reaction score
4,963
Location
Florida
Ram Year
2017
Engine
Hemi 5.7
There are a few versions of the 5th gen fan. As long as it is the standard hemi fan it should bolt right up with no modifications. I cross referenced a few part numbers to confirm fitment. The heavy tow package uses a different radiator than the standard or v6 so I cannot confirm if it would be a direct fit. The ecodiesel and heavy tow both use a 800 watt fan motor. This is the fan I bought.
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Here’s the 2012 v6 fan next to the 5th gen hemi fan.
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Here’s the fan mounted in the truck.
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Here’s a video just showing the fan being operational and to hear the fan.
Fan ramp from 15% to 100%
 
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