Express & G-Series Vans Offered in both a full size van, or a large box truck, the Express is the modern GM workhorse

Chevrolet Express
Platform: GMT Van

What are these wires for ? (2001 Express 1500 Lt 5.7L)

Old March 13th, 2016, 9:44 AM
  #1  
CF Junior Member
Thread Starter
 
Salto_jorge's Avatar
 
Join Date: Feb 2016
Location: Boulder Cnty Colorado
Posts: 31
Likes: 0
Received 0 Likes on 0 Posts
Default What are these wires for ? (2001 Express 1500 Lt 5.7L)

While trying to remove the clutch fan (a nightmare), I found a cit wire and disconnected wire pushed behind some other things. What are these wires for and where or what should they be connect to ? The blue wire is clipped or the end fell off. The orange/red has a fastner attached and is not connected to anything. The white wire is connected to the chassis, two wires have something attached to them.




The metal bar is being used in an attempt to remove the clutch fan.


(2001 Express 1500 Lt 5.7L)

Last edited by Salto_jorge; March 13th, 2016 at 9:47 AM.
Old March 13th, 2016, 11:18 AM
  #2  
CF Active Member
 
Black'95's Avatar
 
Join Date: Nov 2014
Location: Aberdeen, SD
Posts: 187
Received 30 Likes on 26 Posts
Default

They are part of the trailer wiring harness. The black thing attached to them is a fuse case with a fuse inside it. According to my 2001 Owner's Manual vans can have a four-wire harness or a three-wire trailer wiring harness. The three-wire harness is described on page 4-42 of the owner's manual as a dark blue wire for electric trailer brakes, an orange wire for trailer accessory, and a white wire for ground. The red wire is the power wire going through the black thing which is the fuse to the orange accessory wire. It would only be connected to power if you were actually using the wiring harness. The other wires for the tail and brake lights are bunched up in the frame of the van at the rear. You can check them out with a continuity tester.

Last edited by Black'95; March 13th, 2016 at 2:08 PM.
Old March 13th, 2016, 11:48 AM
  #3  
CF Senior Member
 
greenfire's Avatar
 
Join Date: Jan 2013
Location: Greenwood Lake NY
Posts: 313
Received 2 Likes on 2 Posts
Default

That is all aftermarket wiring. Probably was attached to something that is no longer used.
Old March 13th, 2016, 2:07 PM
  #4  
CF Active Member
 
Black'95's Avatar
 
Join Date: Nov 2014
Location: Aberdeen, SD
Posts: 187
Received 30 Likes on 26 Posts
Default

Originally Posted by greenfire
That is all aftermarket wiring. Probably was attached to something that is no longer used.
Sorry it is not aftermarket, it comes from the factory that way and is mentioned in the owner's manual. It is just not hooked up, you hook it up if you plan on using it.
Old March 13th, 2016, 6:58 PM
  #5  
CF Veteran
 
canucklehead's Avatar
 
Join Date: Dec 2012
Posts: 1,584
Likes: 0
Received 6 Likes on 6 Posts
Default

Trailer brake control?
Old March 13th, 2016, 9:50 PM
  #6  
CF Junior Member
Thread Starter
 
Salto_jorge's Avatar
 
Join Date: Feb 2016
Location: Boulder Cnty Colorado
Posts: 31
Likes: 0
Received 0 Likes on 0 Posts
Default

The van has a factory installed hitch and large round trailer connector.

The only question is where are the Orange and Blue wires supposed to connect to ?

Dark Blue: Use for electric trailer brakes (seven-wire harness only)
Orange: Trailer accessory (seven-wire harness only)
Old March 13th, 2016, 11:39 PM
  #7  
CF Veteran
 
canucklehead's Avatar
 
Join Date: Dec 2012
Posts: 1,584
Likes: 0
Received 6 Likes on 6 Posts
Default

Look under the left side of the steering column to see if those wires are there too. I bet its for a brake control.


Thread Tools
Search this Thread

All times are GMT -5. The time now is 8:06 AM.