They make the wiring adapter linked above that makes it easy to tap into the trucks wiring back at bumper to get the brake, parking, and turn signal light wires from the truck without cutting and splicing into the factory harness. Of course you'll need to do the wiring for the brake controller in cab and physically mount it. I prefer to use 2 conductor 14 gauge wire in a heavy protective sheath. These 2 wires are needed because standard trucks did not have these wires in factory harness. One from the brake controller signal, and one for the constant 12V to charge the breakaway battery on trailer. You will need to run 2 additional wires from under dash to the back of truck. All these components come with wiring diagrams but won't have a diagram for your truck's wiring but if needed that is available here under the pinned topic "Ford Truck info and them some". You will need a brake controller installed in cab. You need to get the wire harness that goes with the connector or get a kit that has the wiring with a 7/4 connector. The back connector is somewhat universal. The connector you have listed is for modern vehicles that are already wired for 7 pin trailers. Otherwise you'll need to try to find the easy connect T for back at the bumper for stop/turn and running lights, assuming the AAW kit uses it and then run the extra wires forward for the trailer brakes. But that's me, and I havent found a source for direct crimp automotive fuse boxes yet. If I was doing it from scratch I would add a separate fuse box for the trailer and run a wire set from that to the 7/4 pin connector and to under the dash for a brake controller. The trucks that came with that wiring from the factory used some relays a splicing up front. The AAW kits dont have provisions for trailer wiring. Do I need the old style 'trailer brake control' module in the cab wiring? Sorry for my inept confusion!īut thanks for your patience!Yeah, sounds like you're in over your head a little. I like the 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle EndItem # HM40975,Īs that is what I want to have in the end product! But the actual connections to my '78 F250 wiring system is unclear to me. Okay gentlepersons, but how do I go about wiring it into my '78 F250 wiring harness? That looks like you would have a 7 blade already on the truck and plug this into it to have both a 4 flat pin & 7 blade at the rear at the same time?ĭave -The TEE harness to the 7 blade socket and the adapter from 7 blade to flat 4 To tell the truth I have never used the adapter but maybe my son has only last year when he used the truck to pull a Uhaul trailer. Now if I have the need to pull a flat 4 pin trailer I have adapter to go from the trucks 7 blade to flat 4 I keep behind the seat storage.īTW my 02 Durango has the factory tow package and only had the 7 blade connector out back but the factory also gave a 7 blade to flat 4 adapter in the glove box. I also ran 10 ga wire for trailer brakes & 12 volt power into the connector socket with fuses. I cut the flat 4 pin off and wired this into the 7 blade connector socket. On my 81 I use a trailer wiring harness Tee that fits between the frame rail harness and tail light harness. looks like you would have a 7 blade already on the truck and plug this into it to have both a 4 flat pin & 7 blade at the rear at the same time? Just buy one of these with both options in the same housing and wire it up. I was only hauling a couple of hundred pounds in addition to the trailer itself, so risked foregoing the need for trailer brakes but it obviously got me to thinking ahead to when I wire my F250!Īny experience/expertise/advice is appreciated, as I obviously know enough to be 'dangerous' about this stuff. So I improvised & bought a wiring connection kit with the 7 pin female side & a 4 pin plug on the other end with a couple of other wires which I suspect were for the trailer brakes which I did not use. Will I have to make my own adapter to house both connectors at the bumper? Is it possible to wire it for both, & what will I need to know/do? Obviously I am in way over my head with this idea which came to me last weekend when I borrowed a friend's trailer with it's 7 pin round connector & my vehicle only had a 4 pin straight connection. I have a new wiring system/set from American AutoWire. I want to wire my '78 F250 Ranger XLT for a 7 pin trailer connection, as well as a 4 pin straight connection if I can figure out how to do so.
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