Where is trailer plug? (1 Viewer)

[MJK]

Here is the 7 pin on my 05 (photo taken from rear bumper, looking towards Driver's Rear tire)

Wiring connects to the Driver's side plug shown in @SHOSHO 's pic above.

 

[ramangain]

Correct. IIRC, Mr. T. changed the tow wiring set up from 2003 on to have the brake controller plug under the dash and the 7 pin connector plug at the rear bumper.

Bada bing!

 

[SHOSHO]

Here is the 7 pin on my 05 (photo taken from rear bumper, looking towards Driver's Rear tire)

Wiring connects to the Driver's side plug shown in @SHOSHO 's pic above.

View attachment 2330775

I am having a hard time finding something similar. Buying toyota thing costs $250+

 

[MJK]

I don't see any reason you couldn't use something like a Hopkins kit and simply connect to what Mr T provided.
If you could find a matching (edit: Sumitomo style?) plug, that would be ideal. If not, something like a Deutch Connector would work well.
Use a DMM and you should be able to match up the pins easily enough

 

[SHOSHO]

I don't see any reason you couldn't use something like a Hopkins kit and simply connect to what Mr T provided.
If you could find a matching plug, that would be ideal. If not, something like a Deutch Connector would work well.
Use a DMM and you should be able to match up the pins easily enough

So now you mean I should cut beyond the socket or plug on the back of my truck, buy this deutch connector, and make a connection to the flat 4 pin?

Well how do I know which wire is which? Also, I am not sure how many wires come from the vehicle to that socket.

 

[ramangain]

I looked online a bunch more for an OEM part. I couldnt find anything.

So, either pay for the OEM Mr. T solution, or make it a documented DIY project and share with the forum for posterity and be FAMOUS!!!

 

[SHOSHO]

I looked online a bunch more for an OEM part. I couldnt find anything.

So, either pay for the OEM Mr. T solution, or make it a documented DIY project and share with the forum for posterity and be FAMOUS!!!

Probably I will be doing a documented DIY if someone can tell me how to know which wire is which!

See picture below, I bought this from Amazon, it has 7 wires total. I will be removing the gray heads.

Buy toyota plug ~ $10. Put in these 7 wires in the toyota plug, and then connect the whole thing to the socket on the truck! I figured this might work.

Only problem, not sure which wire should go to which port.

 

[MJK]

You can make an OEM style one if you are so inclined.
I don't know what you have on your trailer, but 7 pin/4 pin/combo vehicle mounting kits are available from Hopkins and other manufacturers. So, all you have to do is mount it and connect it electrically.

How you physically go about the electrical connection is up to you. You can snip both sides & go with Deutch or similar. Or you can try and build a harness to match the OEM Sumitomo (?) style connector to make it plug and play / removable with what Mr T provides. Or you can ugly-splice it.

Also, how much you connect up is up to you.
Light trailers normally have 4 pin connectors containing wires for L turn, R turn, brake/running lights and Ground wires. Do this at minimum.
7 pin adds aux power, electric brake control and reverse lights.

(EDIT: the rest deleted in favor of the post below)

 

[SHOSHO]

You can make an OEM style one if you are so inclined.
I don't know what you have on your trailer, but 7 pin/4 pin/combo vehicle mounting kits are available from Hopkins and other manufacturers. So, all you have to do is mount it and connect it electrically.

How you physically go about the electrical connection is up to you. You can snip both sides & go with Deutch or similar. Or you can try and build a harness to match the OEM Sumitomo (?) style connector to make it plug and play / removable with what Mr T provides. Or you can ugly-splice it.

Also, how much you connect up is up to you.
Light trailers normally have 4 pin connectors containing wires for L turn, R turn, Brake and Ground wires. Do this at minimum.
7 pin adds aux power, electric brakes and reverse lights.

This is a good reference guide, IMO.

Use at your own risk:
I believe late 100s are prewired to accept a trailer brake controller under the dash but do not contain one. Therefore I would ASSUME the 6 pin sumitomo (?) connector you showed a photo of contains L turn, R Turn, Tail Lights, Ground, Reverse and e-brake control (prewire only). If you are comfortable using a digital multimeter, you should be able to confirm/identify which wire does what fairly easily and connect it to whatever you are trying to build for your application.

HTH

Okay thats a nice write up. I am not very electrically inclined (thats why chose mechanical engineering than electrical). Thats why I am so lost here.

I do not want to splice wires because I know the truck will catch fire.

What I think I will do is, (see pic above) I bought that connector from Amazon for $21. It has 7 wires. I will pull these wires from their housing (gray). They have a metallic clips (not sure what are they called). Then, I will buy that toyota plug that snaps into my truck socket. And just plug in the wires to that toyota plug and then into the socket.

I assume this will work? only doubt is where should each wire goes. There is a DIY here that does a similar thing. I will try and follow the wires directions. If its a pass, I will share it. Probably costs $50 vs toyota ones $250

 

[ramangain]

In addition to advice given by @MJK keep in mind these wires are generally color coded too. However, always double check with a multimeter. Taking your time with crimp connectors, electrical tape, and wire loom, it should take an afternoon and be a 1 banana job.

 

[MJK]

Do your own due diligence, but I took my DMM to mine and here is how it pins out from the vehicle to the OEM 7 blade receptacle:

The colors I reference above (in text) are those from the OEM pigtail. From what I can tell the pigtail and vehicle wire coloring matches, but I didn't feel like taking the spare down to confirm. If they are, then it appears:
Green = tail/running lights
Red = Left turn signals
Brown = Right turn signals
White (thicker wire) = Ground
Yellow = Reverse
Blue = Prewire for trailer brake controller
Black = Aux 12V

 

[ramangain]

PowerPoint and everything. Impressive.

 

[MJK]

 

[hankinid]

I'd go to e-trailer.com and check wiring color codes.

 

[gregnash]

7 Way Trailer Wiring Harness DIY

After looking around for a used 7 way trailer wiring harness(Toyota pn: 82177-60010, Wire Frame No. 4) and having no luck, I decided to build my own. The Toyota price of $210 + shipping was riddiculous to me for what that is. I wanted to stay as stock as possible in this and avoid cutting the...

forum.ih8mud.com

 

[TMoney10]

My 2000 LC has this plug on the driver side rear That's strange, I got have factory tow hitch and 4 pin connector also.

I wonder if I can use the OEM Toyota 7pin

I checked under the dash for the brake controller one but didn't find any at all.

 

[ramangain]

@gregnash about that mystery plug

 

[gregnash]

Yeah I tested that one with a multimeter and got no power coming to mine that I could determine. Not sure exactly what it is, maybe for units with rear AC??

 

[TMoney10]

Yeah I tested that one with a multimeter and got no power coming to mine that I could determine. Not sure exactly what it is, maybe for units with rear AC??

Dam okay I was hoping it be the 7pin harness

 

[gregnash]

Dam okay I was hoping it be the 7pin harness

Yeah I don’t believe that Toyota ended up adding 7-pin wiring until like 2008-2010 time frame.