7-pin black 12v trailer wiring question

[tonto]

Hey all, does anyone know what the max draw (amps) of that center pin (black 12v) in the trailer hookup is? I looked in the owners manual but can't figure it out.

That pin is typically used, for instance, for like extra interior lights and crap in horse trailers and whatnot, but I need to know what either the wire itself can hold, or the fuse (whichever is smaller value).

In other words if the fuse is 10A, but the wire diameter will only support 5A, then 5A is what I need to know.

Anyone? Thanks

[edit]: Forgot to mention I have a 2007 SR5 (v8 if it matters)

 

[NeutronJon]

I don't have a spec sheet in front of me that tells me the wire diameter, but part of the design criteria for fuse selection is to ensure that the fuse will be the most limiting component. IE, if the wire will only handle 5 amps before it melts, your fuse will likely be a 2 or 3 amp rating, and in no case shall it ever exceed 5. The fuse is selected to ensure that it will be the first thing to fail so that it will (hopefully) prevent a fire in an overload condition.

I'm not a Toyota Expert, but I've been an Electronics Technician for over 8 years and have had formal training.

 

[My4RUNNERS]

7-way Outlet Extension...

My 2006 V6 has an aftermarket tow bar installed. The 7-way trailer outlet is located under the car and is too far to reach... I can install a bracket on the hitch receiver that a new outlet can be installed on. I need to build an "extension cord" between the onboard outlet and the new hitch receiver bracket. I think I can use the following to solve my problem:

1. Electric mounting bracket
2. 7-Way RV Blade Harness
3. 7-Way Tow Vehicle End Socket

I want to be sure the harness can be used in this application. I contacted the manufacturer, but haven't received a response...

If the photo does not load, the file is attached also.

Thank you to those more knowledgeable than me, for your help with this project. :thumb3:

 

[TechWrench]

My 2006 V6 has an aftermarket tow bar installed. The 7-way trailer outlet is located under the car and is too far to reach... I can install a bracket on the hitch receiver that a new outlet can be installed on. I need to build an "extension cord" between the onboard outlet and the new hitch receiver bracket. I think I can use the following to solve my problem:

1. Electric mounting bracket
2. 7-Way RV Blade Harness
3. 7-Way Tow Vehicle End Socket

I want to be sure the harness can be used in this application. I contacted the manufacturer, but haven't received a response...

If the photo does not load, the file is attached also.

Thank you to those more knowledgeable than me, for your help with this project. :thumb3:

If you look at the wire harness for the trailer connection, underneath next to the spare, you should see that the harness is looped around a couple of wire tie straps. If you cut them and loosen the harness, you should have enough length to reach the new connector mounting position you want. That's how it worked on mine. No extension needed.

 

[My4RUNNERS]

If you look at the wire harness for the trailer connection, underneath next to the spare, you should see that the harness is looped around a couple of wire tie straps. If you cut them and loosen the harness, you should have enough length to reach the new connector mounting position you want. That's how it worked on mine. No extension needed.

I took my 4R to the dealer to get them to correct the error. Unfortunately, my veh did not have enough of that looping action. There was some extra length, but not enough - I was in the bay while the 4R was on the lift and even tugged on the cord. The harness was coming out of an routing hole of some sort and the front end of the bracket only went as far as the front end of the tow bar. Outlet still too far under for me to reach (ok, ok, I'm old and infirm and reaching makes my back hurt! :cry2: ) I still need about a 2 foot (with ease) extension to bring the outlet to where I want it within easy reach. So I think I am going to go with what I think I need and see how it works out...

Thanks for responding and your input. Much appreciated.

 

[moneypit]

Trailer plug

Why not just install something like this? Save your back.

https://www.amazon.com/Conntek-7-Pin-Trailer-Extension-4-Feet/dp/B0057KB0J8

 

[TechWrench]

I took my 4R to the dealer to get them to correct the error. Unfortunately, my veh did not have enough of that looping action. There was some extra length, but not enough - I was in the bay while the 4R was on the lift and even tugged on the cord. The harness was coming out of an routing hole of some sort and the front end of the bracket only went as far as the front end of the tow bar. Outlet still too far under for me to reach (ok, ok, I'm old and infirm and reaching makes my back hurt! :cry2: ) I still need about a 2 foot (with ease) extension to bring the outlet to where I want it within easy reach. So I think I am going to go with what I think I need and see how it works out...

Thanks for responding and your input. Much appreciated.

You must be intending to relocate the outlet in an unusual area, because I upgraded both my '03's to frame mounted hitches, and in each instance I was able to remove the mounting tie wrap points underneath and gain more than enough extra harness to reach the new mounting point on the crossbar of the hitch. I would have someone else, beside the dealer, check on the harness for you. It may be that they don't wish to remove the wire tie supports for the wire harness for who know what reason. I know a lot of others here have done this to gain the extra length needed with no issues. If you still need to go with an extension to the harness, just beware that any connection, especially one located underneath, will be prone to water intrusion and corrosion failure at some point.