Serious Explorations Ford Explorer and Ranger Message Board
#1 Resource for Ford Explorer and Ranger Owners - By Enthusiasts, for Enthusiasts.

Ford Explorer Generation Guide

EF Swag Store 2016 Ford Explorer Forums Elite Membership Chat Room My Posts Reviews Explorer Photo Gallery
Go Back   Ford Explorer and Ranger Forums "Serious Explorations" > Ford Explorer Ranger Repair - Troubleshooting - Modifications & Detailing Forums > 1995 - 2001 Explorer Ranger Mountaineer - Sport thru '03 - 2nd Generation > Stock 1995 - 2001 Explorers


Stock 1995 - 2001 Explorers Questions related to non-modified 1995-2001 Explorer, Mountaineer, Ranger and '02+ Sports and Sport Trac. Problem solving, maintenance, TSB, service bulletins, owner reviews, specifications.

EATC Weirdness and Wiring Diagrams?

Thread Tools
Old 07-15-2005, 07:07 PM   #1
Elite Explorer
Chicago, IL
'07 Mountaineer
Join Date: Jan 2004
Posts: 75

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
(Original Poster)
EATC Weirdness and Wiring Diagrams?

So, on my 96 Limited, the EATC blower motor speed controller module went out. We lived with the blower fan only working on high for several months. Then it started working again. Then one morning the truck was dead, the battery was dead, and when I hooked up the battery charger, the blower fan came on, even though the ignition was turned off. I disconnected the battery, charged it up, and when I reconnected it after a few hours, the blower fan stayed off. My suspicion was that the flaky blower motor speed controller module was the problem, so of course I put off doing anything about it for a couple weeks. Then the truck was dead again.

So I got a new blower motor speed controller module, which comes with a new connector that you have to splice onto the existing wiring. And of course, all 5 of the wires on the connector are white. So I got out my Ford Technical Services Publications CD I got offa eBay to look at the wiring diagram.

According to the CD, the blower motor speed controller module shouldn't be able to turn on the blower fan with the ignition off. The wiring diagram says that power comes from the power distribution box, is switched by a blower motor relay that is controlled by the ignition switch (on in Run), to the blower motor, to the EATC blower motor speed controller, to ground. So there should not be any power to the blower motor with the ignition off.

The blower motor relay is supposed to be in auxiliary relay box #2. Also in there are supposed to be the fog light relay and the windshield washer pump relay, for a total of 3 relays. In auxiliary relay box #2, I have two relays, not 3. Neither was stuck on, and both turn on and off as they're supposed to.

So with the key off, the blower motor relay should not be turned on, and apparently is not turned on. There should be no circuit path from +12 to the blower motor to the blower motor speed controller module (and thence to ground to complete the circuit). So when I pulled the controller module, I checked the wire from the blower motor that should have no power to it. It did. According to the wiring diagram, this is impossible. (However, it would explain why the bad blower motor speed controller module could let the blower fan run with the ignition off).

So my question is, does anybody know how this is really wired? I'm thinking that with EATC, there really is no blower motor relay, that power runs from the power distribution box, to the blower motor, to the blower motor speed controller module, which switches the blower motor on and off at various speeds. This would explain why the auxiliary relay box # 2 is short one relay, and why the blower fan would run with the ignition off and drain the battery (with the bad speed controller in place). It would also mean that the wiring diagram is wrong. Anybody know?
DavidEBSmith is offline   Reply With Quote
( Join the Elite Explorers )

Join the Elite Explorers for only $20 a year. Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose and fix problems yourself, and learn which modifications really work without having to experiment on your own. Elite Explorer members can change the forum "styles" to eliminate most ads, including blue underlined links, and no ads on photos. Other benefits include the ability to store 1000 Private Messages, upload photo attachments directly to your posts and to our Photo Gallery and more. Join the Elite Explorers today.

Old 07-15-2005, 07:49 PM   #2
Elite Explorer
Knoxville, TN
CDW6212R's Avatar
98 Mountaineer A4WD
Join Date: Jun 2004
Posts: 13,624

Vehicle Specs

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 111 Post(s)
I don't know the answer, but I'd look harder at the wiring diagrams. Look at other model years, because the 95 was a brand new system. Changes are typically made often in the first years of a new design. I cnnot remember for sure, but I think my 99 Limited had just one empty relay hole in that #2 box, under the air cleaner. Good luck,

91 Lincoln LSC/SE/GTC, 99/93 Explorer Limited 4WD, 98 AWD Mounty with 255/55/18's, big sway bars, and 12.75" x 1.25" rotors. Soon a BW4406, built trans, stereo and interior.
The best thing that could help us all, is the Fair Tax Plan.
Be American, Buy American (Manufacturer)
CDW6212R is offline   Reply With Quote
Old 07-15-2005, 11:13 PM   #3
Transplanted Bostonian
East Brunswick, NJ
V8BoatBuilder's Avatar
97 Mountaineer V8 4x4
Join Date: Nov 2002
Posts: 3,428

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
If you go to page 14 of the following car domain site:

The author describes how he added an EATC to his ranger. A lot of the EATC wiring and basics are clearly described.

Off Road: 97' Mountaineer: V8, 4x4, 4.56s, 4" Superlift, SOA, TrXus 33x12.5 - Under The Knife
Work: 00' Ranger 4cyl 5spd, 02' Ford E250 5.4
On Road: 2006 VW Jetta TDI/6spd DSG. Fill it with diesel, please.
Octopus Yachts, LLC Engineered Marine Electrical Systems
V8BoatBuilder is offline   Reply With Quote

Suggest this thread to friends:

Join the "Elite Explorers" Today!

Search Explorer Forum

Top of Page

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

Forum Jump

All times are GMT -5. The time now is 05:13 PM.

US Flag
We Support Our Troops!

Explore the site!

Copyright 2015 - 1996 Rick Horwitz Photography

Ford Motor Company is not involved in the management of this site in any way.

All tips on this site are for use at your own risk and discretion.

Modifying the suspension on any vehicle will cause changes to its handling characteristics.

Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.