Blower Motor Wiring Help Needed!!! - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-01-2012, 12:38 AM   #1
Jeeper
 
bwpilot20's Avatar
 
Join Date: Nov 2011
Posts: 61
Blower Motor Wiring Help Needed!!!

My jeep has suffered the famous blower motor switch meltdown at some point in the past. When I bought it, fan speed 3 was intermittent and so I tore into the dash to find a unique problem....

Both the fan speed switch and the 3 prong switch next to the vacuum control have been melted. Someone added a relay to the input node of the blower switch by tapping into the 12V socket (I assume for power and ground since two of the relay wires went to each of the socket wires) and also tapping into the middle prong of the vacuum control switch. Needless to say I don't quite understand what they did by adding a relay only to the input node, but whatever they did, it resulted in two of the relay socket prongs melting. I tested the fan on high and found the relay to get extremely hot as well as the two wires that corresponded to the melted socket prongs. The relay they used was a 30amp max relay... Also, I actually have a 4 prong plug that isn't plugged into anything and one wire is cut on it. I have no idea what this plug is for but it has positions 1-4 marked on it and the words "3 amp" on it.

I was able to get the whole system working by installing a new blower switch and various new spade connectors for all previously melted connections. So here I am a few months later and I get the ole acrid smell through the vents and sure enough the relay is melting its way into oblivion.

I've decided to truly fix the problem and I need help with a few things. My plan is to add 40amp relays to each fan speed and I understand how to do that. I've already disconnected the old relay from the 12V socket and rewired the socket so that it is separate from anything else, the way it came from the factory. So...

Where does the input node of the blower switch need to be connected?
Where does the middle prong of the vacuum switch need to be connected?
And out of curiosity, what is the extra plug for?

I've cleaned my resistor and it works fine (since I had all four speeds). I removed my blower motor and am probably just going to replace it since it's obviously worn out enough to melt the wiring once before... I'll post pictures of everything in a little while.

__________________
2000 TJ 4.0, NV3550, NP231, D30/35, 3.07's
bwpilot20 is offline   Quote Quick Reply
Old 05-01-2012, 01:31 AM   #2
Jeeper
 
bwpilot20's Avatar
 
Join Date: Nov 2011
Posts: 61

My Frankenstein setup! Notice the unused plug with one wire cut!






Melted Relay. Yellow wire (30) went to input node. Red wire (87) went to 12V socket (prob positive). Blue wire (86) went to middle prong of vacuum switch. Brown wire (85) went to 12V socket (prob ground).


Close-Up of "Mystery" connector.


What is this connector for?

ANY HELP IS GREATLY APPRECIATED!!!

__________________
2000 TJ 4.0, NV3550, NP231, D30/35, 3.07's
bwpilot20 is offline   Quote Quick Reply
Old 05-01-2012, 08:57 AM   #3
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,093
Images: 2
I've only had to redo the wiring on an older TJ which is different so I can't help on the above, but I can offer that since your wiring has melted again, the likely root cause is the fan motor. Once the fan motor starts going bad, it starts drawing a lot more current which starts melting wiring, the switch, etc.

Fortunately, the fan motor is an easy swap from the engine side of the fire wall once you remove the battery.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 05-01-2012, 11:50 AM   #4
Jeeper
 
Shelby427's Avatar
 
Join Date: May 2011
Location: Lakeland FL and Hooversville PA
Posts: 2,098
If it's any help, you can get a wiring diagram here.
Jeep Knowledge Base
__________________
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.
Shelby427 is offline   Quote Quick Reply
Old 05-01-2012, 12:37 PM   #5
Jeeper
 
bwpilot20's Avatar
 
Join Date: Nov 2011
Posts: 61
Yeah it's kind of a nightmare. Thanks for the diagram. I know it's what I need, now I just have to teach myself how to read it!
__________________
2000 TJ 4.0, NV3550, NP231, D30/35, 3.07's
bwpilot20 is offline   Quote Quick Reply
Old 05-01-2012, 12:42 PM   #6
Jeeper
 
bwpilot20's Avatar
 
Join Date: Nov 2011
Posts: 61
Does anyone know what the "input" node for the blower switch is for? I'm kinda thinking it just powers the switch and so maybe I can just run a relay on it and 12V straight from the battery??? Everybody always adds relays to each speed node but nobody every says anything about the input node...
__________________
2000 TJ 4.0, NV3550, NP231, D30/35, 3.07's
bwpilot20 is offline   Quote Quick Reply
Old 05-01-2012, 05:52 PM   #7
Jeeper
 
bwpilot20's Avatar
 
Join Date: Nov 2011
Posts: 61
Never mind, I got my answers. Thx

__________________
2000 TJ 4.0, NV3550, NP231, D30/35, 3.07's
bwpilot20 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may 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



logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 08:16 PM.



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