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Any issue putting the 850w fan on with the base alternator?

ecidiego

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*** EDIT AFTER INSTALL ***

PARTS:

MOPAR 850 Fan for JL and JT:
68272755AD
MOPAR 240a Alternator for JL and JT: 56029803AA
MOPAR Z Case Fuse Array for vehicles with 850w fan: 68368854AA

Don't put the fan on a 180a alternator truck. While it may work, I was thinking that's a huge difference....180a to 240a in the tow package or aux switch package. I was about to buy a 240a but then realized I had a 220a....from the 8.4 Premium Audio package. I installed the fan and it's working fine with the 220a. There is no BCM config or ECU tuning involved. This is all wires and fuses.

Some things to consider:

Z Case Fuse Array:


ALWAYS check your Z case fuse array on the PDC for 100a on Z5. If you have the 60a, you MUST replace this array with the 100a version. My 2021 had the 100a despite not having the tow package or aux switches. It's possible they all have it now but check anyway. If you have the 60a, you also need to make sure the wiring from Z5 to your fan is capable of 100a. Unknown if Jeep used a different harness here but if they did you need it. ALWAYS check for 300a on Z7. This will ensure you can handle all of the alternators available for the Gladiator. If you have something lower, you need to upgrade that harness too. I haven't seen anything but 300a here. Credit to @ShadowsPapa for alerting me to check this. If your fuse array doesn't look like this, you MUST buy MOPAR part # 68368854AA :

afafaf.png


qefeqf.png

Alternators:

MOPAR 56029597AB 180a
: comes with Gladiators missing all three of these: 8.4 Premium Audio, Aux Switches, Tow Package. Not good enough for the 850w fan....upgrade to the 240a.

MOPAR 56029765aa 220a: comes with Gladiators with 8 4 Premium Audio but missing Aux Switches and Tow Package. I am using this with the 850w fan right now. No issues yet. If there are I will upgrade to the 240a.

MOPAR 56029803AA 240a: comes with Gladiators with either the Tow Package, Aux Switches, or both. If you have the Tow Package you aren't reading this thread. You have the fan. All a factory Aux Switch truck needs is the fan.

Cliffs:

1. Always check Z Case Fuse Array for 100a Z5 and 300a Z7. If lesser, upgrade fuse array and check wiring to fan and alt...upgrade if necessary.

2. If you have a 180a alt, upgrade to 240a. 220a, try it. 240a, good to go.

Directions:

Tools: 8mm and 10mm socket and some extensions. Trim tool for the top 4 push retainers that mount the cover to the fan shroud.


1. To be super safe, remove cables from main battery negative and separate them. Wrap with rags so they don't touch anything or each other. Remove body ground cables from fender. Wrap with rags so they don't touch anything or each other.

2. Remove two 10mm bolts on top of the radiator cover that secure the air intake tube.

3. Loosen the worm clamps at the air filter box and the throttle body. Pull air intake tube off at both ends and rotate 180 degrees, setting it aside by laying it on top of the PCM. You can leave the wiring and clips attached to it this way, you're just getting it out of the way.

4. Remove air filter box. One 10mm bolt on passenger fender. Then wiggle it upwards. The bottom is just squeezed in with rubber posts. Set it aside.

5. Remove the top plastic cover that hides the radiator and fan shroud. 4 plastic push pins. I pried the plastic up WITH the pin by putting the trim tool under the plastic trim, instead of under the push pin. Pop all 4 loose and out of the fan shroud, then slide the plastic backwards towards the engine and it will come out.

6. Disconnect the fan connector, passenger side top. Press the release tab down ( inwards ) and pull apart.

7. Remove two 8mm bolts that attach fan shroud to vehicle. They are near the top left and right sides. Red circles below.

8. Lift the fan assembly up and out. While doing so, on the left you need to very carefully nudge the A/C lines out of the molded in channel in the fan shroud. The channel is the green circle in the image below. You also need to bend the upper radiator hose on the right slightly outboard to clear the mounting tab there. Red circle on left of image below.

9. Install is reverse of removal. Make sure the tabs in the yellow circles of the image below slide into the "holders". Deal with the A/C lines carefully as you did on removal and get them back into the molded in channel.

10. Test for operation. My fan didn't turn on till about 160F coolant temp. Don't say "oh shit" when it doesn't spin on startup. Isn't supposed to.

Image below is the 600w fan. I didn't take a good pic of the 850w fan. The physical layout is the same:

Untitled.png



*** END EDIT ***

ORIGINAL POST:

I bought a takeoff 850w fan off a member here. It's the fan that comes with the tow package. That package also includes the better battery and 240a alternator. I don't have any additional electrical load. I don't tow, have anything wired in over stock etc. Is that alternator necessary for the fan? I assume they include it for a myriad of reasons in that package, not just for the higher output fan. The base fan is 600w. The reason I bought the 850w isn't for accessories or towing load, it's for desert heat. Mojave should have came with it.

Also - I can't see anything in AlfaOBD regarding a fan - assuming it's just plug and play?
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ShadowsPapa

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I bought a takeoff 850w fan off a member here. It's the fan that comes with the tow package. That package also includes the better battery and 240a alternator. I don't have any additional electrical load. I don't tow, have anything wired in over stock etc. Is that alternator necessary for the fan? I assume they include it for a myriad of reasons in that package, not just for the higher output fan. The base fan is 600w. The reason I bought the 850w isn't for accessories or towing load, it's for desert heat. Mojave should have came with it.

Also - I can't see anything in AlfaOBD regarding a fan - assuming it's just plug and play?
The big high amp fuse array - for the base fan that fuse in the array is 60 amp.
It's 100 amp for the larger fan.
The draw of that 850 watt fan at 13 volts is 65 amps.
So yeah, you need a different high amp fuse array.
The 600 watt fan would run 46 amps at 13 volts.
You could at max draw pull 20 more amps.
The alternator would be mostly for the extra fan load, IMO. Towing doesn't draw much load.
 
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ecidiego

ecidiego

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The big high amp fuse array - for the base fan that fuse in the array is 60 amp.
It's 100 amp for the larger fan.
The draw of that 850 watt fan at 13 volts is 65 amps.
So yeah, you need a different high amp fuse array.
The 600 watt fan would run 46 amps at 13 volts.
You could at max draw pull 20 more amps.
The alternator would be mostly for the extra fan load, IMO. Towing doesn't draw much load.
Oh boy - thanks for pointing out that important detail. Oops. This is it correct?

https://mopar.worldoemparts.com/oem...gladiator-z-case-fuse-array-68368854aa?c=az0x

I wonder if the wiring to the fan needs changed as well. What have I done....
 
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ecidiego

ecidiego

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@ShadowsPapa where are you seeing it's 60 base? My Tech Authority USB only shows 1 option:

1674101189406.png



I'll go outside and look
 
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ecidiego

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Oh wow check this out:

2020:

1674101372561.png


2021:

1674101407829.png



2021, 2022, 2023 only list 1 part, the one with the 100a.

2020 has the two options.

Looks like a change was made for simplicity.
 

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ShadowsPapa

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N5 is the fan.
I have another reference somewhere......... 60 amp standard, 100 is heavy-duty

1674101331535.png


My PDFs also only show 100 amp. A change?
 

ShadowsPapa

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Oh wow check this out:

2020:

1674101372561.png


2021:

1674101407829.png



2021, 2022, 2023 only list 1 part, the one with the 100a.

2020 has the two options.

Looks like a change was made for simplicity.
That may be it- it would seem odd since the fuse protects the wiring, not the device, so as long as the wires were the same gauge, they could use the same fuse.

I need to get a pic of my 2022 PDC cover and compare that and other fuses.
 
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ecidiego

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Thanks for alerting me to this.
 
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ecidiego

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I think they cut down on variations in 2021. Another example is halogen trucks already have the 'halo wire' from light plug to BCM. 2020 bros had to run those wires when adding LEDs.
 

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Following since I wanted to make the same changes… Both fan and alternator…
 

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ecidiego

ecidiego

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Following since I wanted to make the same changes… Both fan and alternator…
I've been seeing used alts for $190...low miles. They're about 340 new plus core.

Fan is in the mail....when it gets here I'll post.
 

ShadowsPapa

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ShadowsPapa

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I think they cut down on variations in 2021. Another example is halogen trucks already have the 'halo wire' from light plug to BCM. 2020 bros had to run those wires when adding LEDs.
Somewhere in late 2020 or early 2021, they made a change similar to what you are talking about - cutting down on variations, in the door wiring harnesses. When I added passive entry - there were two possible harnesses for left door and two possible for the right door - with BSM or without BSM.
Benny was making up the kits and posted about the kits, then said that they now had the same harness for either situation - with or without BSM was the same harness number.
Same things for the fuse? And the wiring you mention for the lights?
 
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ecidiego

ecidiego

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Welp....no way to tell without pulling it.

Screenshot_20230118-210225_Gallery.jpg
 
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ecidiego

ecidiego

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Tomorrow I'm gonna try a really bright light and camera angle...reference pic of where to look...

Screenshot_20230118-210650_Chrome.jpg
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