Keep blowing radiator fan fuse - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today



Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 01-10-2017, 03:40 PM   #1
Jeeper
 
MudMinnow's Avatar
 
Join Date: Feb 2012
Posts: 383
MudMinnow is on a distinguished road
Keep blowing radiator fan fuse

I have a 2.4l wrangler. I keep blowing the radiator fan fuse and don't know why. I've had problems with this fuse blowing before, but thought it was the reverse light switch that kept causing it to blow. I replaced that and it worked for a while, then blew again. In the past if the reverse switch was bad, it would blow the fuse as soon as you put it into reverse. And like I said, new switch fixed it for a while. When it blew again, I disconnected the reverse light switch from its wiring. Fuse is still blowing.
MudMinnow is offline   Quote
Old 01-10-2017, 04:11 PM   #2
Mostly old school..!

5-Year WF Supporting Member
 
Water Dog's Avatar
 
Join Date: Mar 2011
Location: Now searching for rocks in Sumner, TX
Posts: 11,647
Water Dog is on a distinguished road
Since an electric fan would have been aftermarket, it would be hard for anyone to know how it was wired in, or what the issue is. Was it wired into the reverse light circuit?

__________________
Dennis
Water Dog is offline   Quote
Old 01-10-2017, 04:17 PM   #3
Jeeper
 
Dextreme's Avatar
 
Join Date: Oct 2011
Location: Oregon City, OR
Posts: 7,165
Dextreme is on a distinguished road
Quote:
Originally Posted by Water Dog View Post
Since an electric fan would have been aftermarket, it would be hard for anyone to know how it was wired in, or what the issue is. Was it wired into the reverse light circuit?
I believe the 2.4L (Neon motors) came with electric fans. I am going to guess the fan might be going bad sucking too many amps...or something in that circuit is shorting/grounding causing the overload.

MOPAR 55037694AB
__________________
'99 Chili Pepper TJ - I4 PowerTech motor
33x12.5 DuraTracs
Zone 4.25"
F8.8/Artec Rear
Dextreme is offline   Quote
 
Old 01-10-2017, 05:16 PM   #4
Mostly old school..!

5-Year WF Supporting Member
 
Water Dog's Avatar
 
Join Date: Mar 2011
Location: Now searching for rocks in Sumner, TX
Posts: 11,647
Water Dog is on a distinguished road
Quote:
Originally Posted by Dextreme View Post
I believe the 2.4L (Neon motors) came with electric fans. I am going to guess the fan might be going bad sucking too many amps...or something in that circuit is shorting/grounding causing the overload.

MOPAR 55037694AB
Learn something new every day.... seems strange that it would have anything to do with a reverse light circuit. Agree that either a short or a failing fan would be the likely culprit.
__________________
Dennis
Water Dog is offline   Quote
Old 01-10-2017, 06:44 PM   #5
Jeeper
 
RUBI 4 MY MRS's Avatar
 
Join Date: Feb 2011
Location: California/Nevada
Posts: 2,344
RUBI 4 MY MRS is on a distinguished road
The back up lights & both of the radiator fan relay’s triggering coils are on the same fuse (7 in the fuse block).

You have the b/u wires unplugged from the switch, right?

Does it blow the fuse as soon as you turn the key on?
__________________


'05 Rubi TJ Unlimited
'93 Toyota 4Runner
RUBI 4 MY MRS is offline   Quote
Old 01-11-2017, 08:30 AM   #6
Jeeper
 
MudMinnow's Avatar
 
Join Date: Feb 2012
Posts: 383
MudMinnow is on a distinguished road
Yes, the 2.4l came with an electric fan whose relays are wired through the #7 fuse. I'm not sure exactly when the fuse is blowing, I'll change it and see it I hear it blow when I turn it on or crank it up. I think you guys are on track with the fan pulling too much amperage and blowing the fuse because of how this issue has been a bit intermittent. I'll go get another volt meter today and start tracing the power to see where it ends.
MudMinnow is offline   Quote
Old 01-11-2017, 08:31 AM   #7
Jeeper
 
MudMinnow's Avatar
 
Join Date: Feb 2012
Posts: 383
MudMinnow is on a distinguished road
Yes, reverse light switch is disconnected.
MudMinnow is offline   Quote
Old 01-11-2017, 04:28 PM   #8
Jeeper
 
RUBI 4 MY MRS's Avatar
 
Join Date: Feb 2011
Location: California/Nevada
Posts: 2,344
RUBI 4 MY MRS is on a distinguished road
The problem is not the fan drawing too many amps. Fuse 7 is only for the relay coils, very low amperage required. You have a short to ground, not an overload. The main power for the fan when the relay is closed is fuse 4 in the PDC.

When it was blowing fuse 7 only when you put it in reverse that would indicate the short was either in the switch or the wiring from the switch to the back lights. If it blows with the switch unplugged you can rule both out which leaves the short being in the wiring from fuse 7 to either the (disconnected) switch or to the fan relays or possibly a shorted relay coil. If so then unless it is intermittent it should blow as soon as you turn the key to the on (run) position.

It seems very odd that it “moved” from only in reverse to not needing it in reverse so it might well be in the harness to/from the switch where both wires are together. Carefully check that harness from the trans, especially when it might get road damage or melted from the exhaust heat.
__________________


'05 Rubi TJ Unlimited
'93 Toyota 4Runner
RUBI 4 MY MRS is offline   Quote
Old 01-17-2017, 11:29 AM   #9
Jeeper
 
MudMinnow's Avatar
 
Join Date: Feb 2012
Posts: 383
MudMinnow is on a distinguished road
Got it fixed. There was a short in the wire going to the reverse light switch. While I was down there looking, I tested the switch for continuity. No continuity with the shifter in reverse. I've replaced this switch three or four times. Anybody have an idea why it keeps shorting out?
MudMinnow is offline   Quote
Old 01-17-2017, 01:16 PM   #10
Jeeper
 
RUBI 4 MY MRS's Avatar
 
Join Date: Feb 2011
Location: California/Nevada
Posts: 2,344
RUBI 4 MY MRS is on a distinguished road
With a short in the wiring on the switch-to-light side not only would it blow the fuse but the shorted current would pass through the switch before blowing the fuse so the switches may have been damaged that way. With the short fixed a new switch should not fail.

At least you found the short.
__________________


'05 Rubi TJ Unlimited
'93 Toyota 4Runner
RUBI 4 MY MRS is offline   Quote
Old 01-18-2017, 04:04 PM   #11
Jeeper
 
MudMinnow's Avatar
 
Join Date: Feb 2012
Posts: 383
MudMinnow is on a distinguished road
Quote:
Originally Posted by RUBI 4 MY MRS View Post
With a short in the wiring on the switch-to-light side not only would it blow the fuse but the shorted current would pass through the switch before blowing the fuse so the switches may have been damaged that way. With the short fixed a new switch should not fail.

At least you found the short.
I don't think the short in the wire caused the switch to go bad. I've replaced this switch 3 or 4 times because they keep going bad. Also, this short came after I disconnected the switch. When I disconnected it the fuse was blowing when I put it in reverse, not when I turned the Jeep on.

MudMinnow is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 01:44 PM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner