jiminmt
Big Sky Country
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I have an 08 Silverado and I'm installing an in-bed connector. As I understand it, on a GM vehicle the blue (post 2) wire is for an aftermarket brake controller. Having an integrated brake controller, is it necessary/important to connect this wire?
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sstgermain
Oceanside RV Park, Magnolia Beach,Tx
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As I understand it the Blue wire goes to the brakes on the trailer regardless of the brake controller being integrated or not. That blue wire goes to your integrated brake controller and controls the brakes on the trailer. It is needed when you put that harness in the bed of the truck.
Unless GM did something funky it is needed.
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BrickBrain
Pearl River, La
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I agree with sstgermain
#2 is for the brake control regardless if it is aftermarket or integrated. You must connect it.
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j2catfish
Newport, NC, U.S.of.A.
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If you use an after market controller with a factory installed Integrated Trailer Brake Controller (because the ITBC cannot be used on electric over hydraulic disk brakes, according to the owner's manual) where under the dash are the wires located on a 2008 GMC?Chevy to which to connect the controller?
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sstgermain
Oceanside RV Park, Magnolia Beach,Tx
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I believe you would have to disconnect the blue brake control wire from the Integrated Brake Controller and hook the aftermarket controller to the Blue wire going to the plug. You would need to call a GM service department for the location of that particular wire.
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Camping Dutchman
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They make(i believe) a kit that you separate the connector in the back, plug the kit in between and it gives you a 7 pin tail for the bed, I want t osay it was reese, I looked at doing it so as not to have my wire over the tailgate...
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luvlabs
Frederick, MD
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Seems to be a lot of confusion going on here.
1) The under the hood blue wire needs to be connected only if you are going to use an aftermarket controller. Otherwise, leave it alone.
2) If you are going to replace the IBC with an aftermarket controller, you have to disconnect the blue wire from the IBC and replace it with the blue wire from the new controller (which you have powered with the new connection under the hood.)
3) You must connect the other, heavier wire (located by the brake master cylinder) if you want a 12V power source going to your trailer.
4) And finally, if you want to install electric over hydraulic brakes and use the IBC, you need to purchase two brake magnets and connect them in parallel to the blue wire and white wire (in the trailer, not the truck). This simple "fix" allows the IBC to see the connection to the trailer's braking system. The constant 12V power wire goes to the hydraulic actuator (as well as the blue wire and anything else that is needed per the wiring diagram).
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j2catfish
Newport, NC, U.S.of.A.
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luvlabs wrote:Seems to be a lot of confusion going on here.
1) The under the hood blue wire needs to be connected only if you are going to use an aftermarket controller. Otherwise, leave it alone.
2) If you are going to replace the IBC with an aftermarket controller, you have to disconnect the blue wire from the IBC and replace it with the blue wire from the new controller (which you have powered with the new connection under the hood.)
3) You must connect the other, heavier wire (located by the brake master cylinder) if you want a 12V power source going to your trailer.
4) And finally, if you want to install electric over hydraulic brakes and use the IBC, you need to purchase two brake magnets and connect them in parallel to the blue wire and white wire (in the trailer, not the truck). This simple "fix" allows the IBC to see the connection to the trailer's braking system. The constant 12V power wire goes to the hydraulic actuator (as well as the blue wire and anything else that is needed per the wiring diagram).
There is some amount of confusion alright. Below is a web site that has the correct way to install an after market controller to control electric-over-hydrualic brakes, if you have the Integrated Trailer Brake Controller installed by the factory or dealership. Sorry 'bout the long URL but hey, I'm an electrician not a serious nerd.
www.etrailer.com/tb-aftermarket-brake-control-wiring-for-2007-2008-gm-full-size-truck-08-0100.aspx or simplier; just go to etrailer.com and search for it!
Following their instructions (a video) I had no problem finding the wire harness below the dash. It also says that the original ITBC will not give a warning on the truck's driver info panel if you have one, connected as above. And you don't have to "fool" the ITBC with no stinkin magnets!!
Hope this helps.
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hook47
Olympic Peninsula, WA, USA
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Take a look at this thread:
The Diesel Place, Towing
This site has lots of info on our trucks.
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j2catfish
Newport, NC, U.S.of.A.
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I complete the wiring on my after marker controller on a 2008 truck with the ITBC installed. You have to run a blue wire from under the dash (connected to the brake controller) all the way to the connector located on the rear bumper, cut the blue wire at the connector and connect the wire you just ran to it. Complete the wire splicing under the dash using the diagram for your controller. The flying end of the wiring harness are located above your left knee when in the driver's seat. I drove it on a test run and it works great. The location for the controller leaves something to be desired but at least I will be able to leave for Myrtle Beach tomorrow.
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