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Unread 08-04-2013, 07:44 PM   #1
r3d70
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1970 FSJ Gladiator 
 
Join Date: Mar 2012
Location: killeen, texas
Posts: 6
Manual fan control

A little backstory- 2002 Grand Cheroke. The electric fan on the radiator stopped working, causing it to overheat anytime im doing under 40mph. Ended up blowing up the radiator. I replaced everything to do with the cooling system, including the radiator fan controller, and the fan still does not turn on. Its still a good fan, jumpers straight to the battery turn it on. So instead of messing around with the factory wiring, im just going to hook up a little switch to run the fan when im driving in the city. Right now the wiring looks like this: battery to switch, to led light, fan, ground. My question is where should i put a fuse? I know i need to have one in there somewhere, i just dont know if it should be between the battery and the on/off switch, or between the switch and the fan. Any thoughts?

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Unread 08-04-2013, 09:44 PM   #2
Holder350
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1995 XJ Cherokee 
 
Join Date: Oct 2007
Location: Whitesburg, Tennessee
Posts: 5,291
You really need to add a relay in there.....

Fuse should go as close to the battery as possible.


Sent from my phone
relaywire.jpg

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95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
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You can tell the character of a person in how they treat someone who can do nothing for them.
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Unread 08-04-2013, 10:29 PM   #3
r3d70
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1970 FSJ Gladiator 
 
Join Date: Mar 2012
Location: killeen, texas
Posts: 6
Hey thanks! I'll see what i can find around here.
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Unread 08-06-2013, 07:27 PM   #4
r3d70
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1970 FSJ Gladiator 
 
Join Date: Mar 2012
Location: killeen, texas
Posts: 6
So another question due to my ignorance and curiosity, if you don't mind, what are the bennefits of running a relay over just wiring everything direct?
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Unread 08-06-2013, 09:43 PM   #5
Holder350
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1995 XJ Cherokee 
 
Join Date: Oct 2007
Location: Whitesburg, Tennessee
Posts: 5,291
You can use less of the expensive heavy gauge wire, you can also use a cheaper lighter duty switch, and all of the amp draw is under the hood, so if in the event the circuit malfunctions and overheats any tire is contained to the engine compartment.

The other main advantage in my opinion is that you can grab power for the switch from a keyed source (only on when the key is on) and the fan will shut off when you turn the motor off, so your not left with a dead battery.

Sent from my phone
__________________
95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
Quote:
Originally Posted by Azzy View Post
You can tell the character of a person in how they treat someone who can do nothing for them.
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