Trailer Brake Control and 7 pin setup help. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68_GMC · 11-21-2018, 07:20 PM

I am wanting to install a new style trailer brake controller into my 68 GMC as well as making it safe to pull our 24 foot camper. It will be all new from the controller to the 7 pin hook up at the rear of my truck. If anyone has ever installed one or knows of a full kit please let me know. I have to make my wheel studs longer as well. Me and my son want to use the camper during the Magic Dragon Car Show at the Lake of the Ozarks, MO next year. Main thing I need information on is 7pin and wiring to the dash. I already have a really nice brake controller TEKONSHA P3 BRAKE CONTROL in my newer truck that I will switch out when I want to pull the camper with my GMC.

Rick Bollinger · 11-21-2018, 08:02 PM

I am going to follow this thread I am planning on doing the same thing. I have wired a few of these before in the past but it was the older analog style controllers. I would think these would be the same. And where did you get your hitch? Was it already on your truck?

68_GMC · 11-21-2018, 08:16 PM

Quote:

Originally Posted by Rick Bollinger

I am going to follow this thread I am planning on doing the same thing. I have wired a few of these before in the past but it was the older analog style controllers. I would think these would be the same. And where did you get your hitch? Was it already on your truck?

I made my hitch. It is made to fit inside the frame rails. There are two 1/4 plates inside the frame the hitch is arch wielded to. But the rest is in planning stage right now. I have never wired up a controller before Thats why I was asking here for pointers if anyone had some.

Andy4639 · 11-21-2018, 09:22 PM

What is it you need to know?

Standard hookup for the 7 pin connector.
The #4 is for a battery charging while pulling the trailer are a winch hook up are any 12 volt hook up. You will have to run a seperate wire for it.
Here is a link on this subject also.

http://67-72chevytrucks.com/vboard/s...d.php?t=598373

Rick Bollinger · 11-21-2018, 09:52 PM

The four wires if I remember correctly the basic brake wires with ground. One red directly to positive on battery. On this one at least 10 ga with 30 amp breaker at battery for power to camper. one for electric brakes from controller. Back up lights. here is a diagram.

Rick Bollinger · 11-21-2018, 09:57 PM

on this diagram it shows the 12 volt as a black wire but I think it is suppose to be red. and the center as the back up lights. I will look for a better picture.

Rick Bollinger · 11-21-2018, 10:18 PM

I guess the black is the proper color for the aux 12 volt. This one shows both the female and male ends.

firedemon · 11-21-2018, 10:29 PM

I ran a 7 pin on mine but made my own harness you will have to run 2 wires from the front to the back the red for the aux power and the blue from the brake controller . the red I ran from a keyed source so whatever you have hooked up isn't drawing the battery down when its parked . make sure you add fuses for these its a long run of wire and they can chafe and short you will be glad you did . I zip tied them to the factory harness and used the factory holders going back . the rest of the terminals can be connected right there in the back after the factory connector in the rear crossmember . inside the cab you need to just tie into the brake switch cant remember the color and another keyed power red and black ground

firedemon · 11-21-2018, 10:30 PM

rick the one andy posted is standard gm I guess they do that because the black would get confused by most as a ground when ground is white standard on trailers for some reason

68_GMC · 11-22-2018, 07:34 AM

Thank you all for responding so fast with so much information and diagrams. I will be using this to plan out the wiring harness and the best way to install all of it. I can't wait to start working on this with my son. He is growing up to fast but was taught a lot of things over those years most kids don't even know about. Thanks again, Stephen.

Andy4639 · 11-22-2018, 10:18 AM

If you wanted to they make a tee for the flat plug that you take the factory connection at the back of the truck loose and plug it in. Then all you need to do is buy the 7 pin plug and run the brake wire and the aux wire from up front.

davepl · 11-22-2018, 10:36 AM

I did something close to what Andy describes. From Amazon I got an adapter that split out most of the wiring I needed, then I had to run power (and maybe one other wire, it's been a couple of years). But the splitter/adapter breaks out most of the connections you need nicely.

68_GMC · 11-22-2018, 10:47 AM

Quote:

Originally Posted by davepl

I did something close to what Andy describes. From Amazon I got an adapter that split out most of the wiring I needed, then I had to run power (and maybe one other wire, it's been a couple of years). But the splitter/adapter breaks out most of the connections you need nicely.

Sounds like that is the way to go. Less wires and would keep it nice a clean under there with less wires. Keep the ideas coming because I know I am not the only person out there wanting to do this.

Andy4639 · 11-22-2018, 12:01 PM

At one time Wal Mart carried the tee for this for our trucks. They also carry the adapter 7 pin plug as well.

projectking · 11-22-2018, 01:52 PM

This will get you close. Cut the flat off, add the brake trigger, and power wires and you’re set to wire the 7 pin.

https://m.autozone.com/electrical-an...let/c10-pickup

11-21-2018, 07:20 PM	#1
68_GMC Registered User Join Date: Jun 2006 Location: Missouri Posts: 211	Trailer Brake Control and 7 pin setup help. I am wanting to install a new style trailer brake controller into my 68 GMC as well as making it safe to pull our 24 foot camper. It will be all new from the controller to the 7 pin hook up at the rear of my truck. If anyone has ever installed one or knows of a full kit please let me know. I have to make my wheel studs longer as well. Me and my son want to use the camper during the Magic Dragon Car Show at the Lake of the Ozarks, MO next year. Main thing I need information on is 7pin and wiring to the dash. I already have a really nice brake controller TEKONSHA P3 BRAKE CONTROL in my newer truck that I will switch out when I want to pull the camper with my GMC. __________________ Last edited by 68_GMC; 11-21-2018 at 07:38 PM.

11-21-2018, 08:02 PM	#2
Rick Bollinger Registered User Join Date: Mar 2018 Location: Colchester IL Posts: 332	Re: Trailer Brake Control and 7 pin setup help. I am going to follow this thread I am planning on doing the same thing. I have wired a few of these before in the past but it was the older analog style controllers. I would think these would be the same. And where did you get your hitch? Was it already on your truck?

11-21-2018, 09:52 PM	#5
Rick Bollinger Registered User Join Date: Mar 2018 Location: Colchester IL Posts: 332	Re: Trailer Brake Control and 7 pin setup help. The four wires if I remember correctly the basic brake wires with ground. One red directly to positive on battery. On this one at least 10 ga with 30 amp breaker at battery for power to camper. one for electric brakes from controller. Back up lights. here is a diagram. Attached Images

11-21-2018, 09:57 PM	#6
Rick Bollinger Registered User Join Date: Mar 2018 Location: Colchester IL Posts: 332	Re: Trailer Brake Control and 7 pin setup help. on this diagram it shows the 12 volt as a black wire but I think it is suppose to be red. and the center as the back up lights. I will look for a better picture.

11-21-2018, 10:18 PM	#7
Rick Bollinger Registered User Join Date: Mar 2018 Location: Colchester IL Posts: 332	Re: Trailer Brake Control and 7 pin setup help. I guess the black is the proper color for the aux 12 volt. This one shows both the female and male ends. Attached Images

11-21-2018, 09:22 PM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Trailer Brake Control and 7 pin setup help. What is it you need to know? Standard hookup for the 7 pin connector. The #4 is for a battery charging while pulling the trailer are a winch hook up are any 12 volt hook up. You will have to run a seperate wire for it. Here is a link on this subject also. http://67-72chevytrucks.com/vboard/s...d.php?t=598373 __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

11-21-2018, 10:29 PM	#8
firedemon Registered User Join Date: Jun 2015 Location: @ Posts: 890	Re: Trailer Brake Control and 7 pin setup help. I ran a 7 pin on mine but made my own harness you will have to run 2 wires from the front to the back the red for the aux power and the blue from the brake controller . the red I ran from a keyed source so whatever you have hooked up isn't drawing the battery down when its parked . make sure you add fuses for these its a long run of wire and they can chafe and short you will be glad you did . I zip tied them to the factory harness and used the factory holders going back . the rest of the terminals can be connected right there in the back after the factory connector in the rear crossmember . inside the cab you need to just tie into the brake switch cant remember the color and another keyed power red and black ground Last edited by firedemon; 11-21-2018 at 10:38 PM.

11-21-2018, 10:30 PM	#9
firedemon Registered User Join Date: Jun 2015 Location: @ Posts: 890	Re: Trailer Brake Control and 7 pin setup help. rick the one andy posted is standard gm I guess they do that because the black would get confused by most as a ground when ground is white standard on trailers for some reason

11-22-2018, 07:34 AM	#10
68_GMC Registered User Join Date: Jun 2006 Location: Missouri Posts: 211	Re: Trailer Brake Control and 7 pin setup help. Thank you all for responding so fast with so much information and diagrams. I will be using this to plan out the wiring harness and the best way to install all of it. I can't wait to start working on this with my son. He is growing up to fast but was taught a lot of things over those years most kids don't even know about. Thanks again, Stephen. __________________ Last edited by 68_GMC; 11-22-2018 at 08:02 AM.

11-22-2018, 10:18 AM	#11
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Trailer Brake Control and 7 pin setup help. If you wanted to they make a tee for the flat plug that you take the factory connection at the back of the truck loose and plug it in. Then all you need to do is buy the 7 pin plug and run the brake wire and the aux wire from up front. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

11-22-2018, 10:36 AM	#12
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,334	Re: Trailer Brake Control and 7 pin setup help. I did something close to what Andy describes. From Amazon I got an adapter that split out most of the wiring I needed, then I had to run power (and maybe one other wire, it's been a couple of years). But the splitter/adapter breaks out most of the connections you need nicely. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

11-22-2018, 12:01 PM	#14
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Trailer Brake Control and 7 pin setup help. At one time Wal Mart carried the tee for this for our trucks. They also carry the adapter 7 pin plug as well. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

11-22-2018, 01:52 PM	#15
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: Trailer Brake Control and 7 pin setup help. This will get you close. Cut the flat off, add the brake trigger, and power wires and you’re set to wire the 7 pin. https://m.autozone.com/electrical-an...let/c10-pickup __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback



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