Need to install a 7 Pin wiring harness on my 02 Sport

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Rancho5

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So my 02 Sport has a flat 4 pin already installed. I need to install a 7 pin round so that I can tow my smallish Coleman Popup. Searches I've done are usually about 4 pin to 7 pin adapters. Can't seem to find a decent 7 pin installation thread.

The harness I'm thinking of installing has the 7 Pin, and a flat 4 pin on the side. Rather than just go to U-Haul and pay them to do it, I'm wondering if there is a simple way to do this myself. On a Suburban I once had, I just unplugged a connector a couple feet back underneath, then plugged in the new harness and all was fine. Wondering if such a thing exists for my 02 Sport.

Thanks for any help
 
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There are no plug-n-play options for a 7-pin trailer connector. You will need to run at least the brake wire from the cab, along with custom wiring the brake controller in the cab. If you are going to run the battery charge wire to the trailer, you'll also have to custom-run that from the battery (either with an auto cutoff switch or constant powered).

-Charlie
 
What phattyduck said. You can't create the two wires used for brakes and battery charging via using an adapter.

If your pop-up doesn't have electric brakes (many don't) and you don't care about charging the camper's 12V battery, change out the plug on the camper to a 4 pin setup.
 
My Coleman Cheyenne weighs 1969 pounds dry. We dry camp so loaded with water, twin batteries and twin propane and gear, call it 2500 pounds.

And I’m not concerned with charging the batteries at all since I pre-charge and use a solar panel to trickle.

That being said, do I need the two extra wires? Opinions appreciated
 
Rancho5 said:
My Coleman Cheyenne weighs 1969 pounds dry. We dry camp so loaded with water, twin batteries and twin propane and gear, call it 2500 pounds.

And I’m not concerned with charging the batteries at all since I pre-charge and use a solar panel to trickle.

That being said, do I need the two extra wires? Opinions appreciated
Click to expand...

As csp asked about, does your trailer have brakes? If not, I'd convert to a flat4 and call it a day. I'm hauling a small trailer with my 4runner and using a flat4 plug just fine and my trailer even has brakes, just not interested in doing all the work for the 7pin.
 
The trailer does have brakes and it’s 2500 lbs loaded. So 2500 is small enough to not worry about brakes in your opinion?
 
Well you will definitely experience longer stops with the added 2500lbs. On flat level ground, not much difference especially if you anticipate and begin braking easy and early.

Guessing your Sport has the factory 16" wheels? If so it's got the larger of the 2 factory rotors yet it's still going to feel taxed on either repeated in-town stops and/or on downhill stops and down mountain passes.

Safety First - I'd make the attempt at adding wiring for the brakes, it just makes sense with your family riding along. Luck. :cowboy:
 
Personally I would make the brakes functional. That weight doesn't sound like a lot, but in a panic maneuver, those brakes can make the difference between stopping and ending up in a ditch.

You'll also need a trailer brake controller. The Tekonsha Prodigy is my favorite.
 
I too would hook up the brakes. I have a pop-up that is about 2200 dry. I towed it home when I bought without brakes and going down a pass. My stopping distance was greatly reduced. I think I may have fried the brake fluid as well. If it has breaks on it, I suggest you get a break controller and hook them up. Your towing experience will be much better.
 
Last edited:
I will be hooking up the brakes! Thanks for your wise counsel.

Why the brake controller? I'm inexperienced as with my F250 I never used one. Wound't me applying brakes on my T4R activate the brakes on the Coleman trailer?
 
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Rancho5 said:
I will be hooking up the brakes! Thanks for your wise counsel.

Why the brake controller? I'm inexperienced as with my F250 I never used one. Wound't me applying brakes on my T4R activate the brakes on the Coleman trailer?
Click to expand...

Unless your trailer has a hydraulic surge brake (it probably doesn't), you will need to install a brake controller in the 4Runner. There's no way for the 4Runner to activate electric brakes on a trailer without adding a brake controller.
 
After looking for a controller there seem to be a myriad of options...Toyota specific harnesses to make it easier etc. I’d like the 7 pin female receptacle on the bumper to also have a flat 4 portion so I can tow my yard trailer.

Would anyone care to provide a list of parts I’d need to do this properly?
 
Rancho5 said:
Toyota specific harnesses to make it easier etc.
Click to expand...
Any Toyota specific harness won't work on the gen3 4Runner. There is no 'plug-n-play' option out there. It is just 4 wires for the brake controller (power, ground, brake wire, and output to trailer) so it should be easy to wire up.

As for parts list - a place like etrailer.com would be your best bet. You need to figure out what parts will work best for you (how you want to mount the 7 pin plug, what controller and where to mount it, etc. will all affect the parts you need to buy).

-Charlie
 
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