Add Rear 12v Outlet/USB

Ian Fox · May 6, 2022

I know there are similar questions asked all over this forum but I'm having a having a hard time putting all the pieces together. Sorry in advance if this is classed as a duplicate - feel free to point me to an existing thread if appropriate.

I have a 2020 Silverado Custom with the center jump seat. Currently, it has the "no storage" seat but I've ordered a replacement and will be adding storage. Ultimately, I'd like to install this wireless charger in my truck:

https://boostautoparts.com/products/2019-newer-gm-charging?rq=th_chevy~yr_2020~mk_silverado&variant=42070253600927

In order to do this, I need a 12v outlet in the jump seat which mine does not have. While I'm doing it, I'd also like to get the rear USB's added next to the rear vents so the kids have a place to charge their devices. It would be nice to have data in the USB ports but it's fine if it would be power only.

My big question is how do I get power to the jump seat? The custom does not have the harness that runs under the seat - I believe this is GM part #84671378 but I'm not 100% sure. If this is the right part where does it connect (does it plug under the dash or is it wired in directly somewhere)?

Thanks in advance,

Ian

haeffb · May 7, 2022

You don’t have to have the 12v outlet to get power to the jump seat console.

My 2022 refresh Sierra doesn’t have the 12v outlet, but I was able to tap into the fuse box and run power to the console to get a Boost wireless charger to work. You should be able to do something similar with a 2020 model. My work truck is a 2019 Silverado, and I’m sure this approach would also work there - just need to determine which fuse and ground point.

This won’t get USB ports in the back, but it’s half your goal.

Ian Fox · May 8, 2022

This is a great - thanks! I did talk to the parts desk at the local dealership and he gave me a schematic printout for an LT with the center console wiring. I'm *hoping* it's just a matter of replacing the type of wiring harness used that provides the additional vehicle options. What I don't know is if I will be able to connect it at the dash. I did order one online just to see - if I can't get it to work I'll probably just do what you did.

Bikerjon · May 12, 2022

Could you post the schematic on here? Also the part # for the harness you ordered? Several of us are having the same problem.

Thank you.

Ian Fox · May 15, 2022

I ordered the following GM parts:

84482761 - wiring harness

25774623 - 12v accessory plug

84166962 - plug cover

I also ordered the Boost wireless charger for my vehicle (2020 Silverado Custom with jump seat).

The GM parts are due to arrive tomorrow (5/16) and I already have the charger. I'm guessing the wiring harness won't work at this point but I have a plan that I'm going with if thats the case. Please keep in mind this is all from a wiring rookie - so feel free to correct me.

Following the idea above about hardwiring the charger, I think I'm going to end up adding a new 12v accessory plug in the rear console (by the heater vents) using an add-a-circuit. There is an existing 15 amp circuit (F34 on the passenger side for my truck) that is used for the cargo lamp. It seems like a safe/non-essential one to use for adding a circuit. Then run wires down the sill, come out by the heating vent and into the jump seat. Once I have the accessory plug in I can just follow the Boost install to put in the charger. This will also allow my to use one of the USB plugs in the accessory sockets for the kids to charge stuff.

Only thing I'm not sure about is the boost charger looks like it's expecting a blue wire as well as a live and ground. I *think* this is the accessory plug lighting but not 100% sure. If thats the case, I'll have to leave that unpowered.

schematic.pdf

Ian Fox · May 19, 2022

Ok I bailed on this....so many things I got wrong . F34 is not switched so don't use it. Also, I had general concerns about actually hooking up the 12v accessory and charger on the same circuit without starting a fire. I think I'm going to follow Brian's instructions for the charger here:

And (eventually) run a second circuit for the 12v outlet.

Edited May 19, 2022 by Ian Fox

Bikerjon · May 19, 2022

You are on the right track. Use F26 circuit. That will work.

Ian Fox · May 21, 2022

So I've run into a snag. It looks like I don't have the additional ground point in my truck.

I'm not sure what the two bolts are on the top left and if they are supposed to be additional ground points. I can't get a reading with them on my meter. I'm not sure if its just paint that needs removing.

Any ideas?

Edited May 21, 2022 by Ian Fox

Ian Fox · May 22, 2022

Nevermind - I got it. Wireless charging is installed. Thanks everyone for the help.

Bikerjon · June 4, 2022

Good to hear you got it! I will be installing the Boost Auto wireless charging into my full center console next week when i finally get it. ( I have been trying to get this console for 3 months).