Use 7 pin trailer outlet to power Viair inflator

I bought a Viair EVC88P digital inflator to carry in my 4Runner, and rather than open the hood and clip onto the plus and minus battery terminals, I'd like to use this adapter to power it from the 7 pin trailer connector.


Any issues with this? It seems like it would work well and I wouldn't have to open the hood, just plug it in and power the inflator. A plus is that the 7 pin connector is next to the receiver hitch, and the inflator lives in the back, so it's literally 2 feet away.

Thanks in advance.

 

Here is the typical connection by pin for a 7-way trailer hookup. While there is a +12V pin available, know that it is only meant to provide a ‘maintenance’ charge current to a trailer’s breakaway battery. No where near what you’d need to power a compressor.

 

I thought that the aux connection supplied 30 amps - more than enough for a small inflator. Obviously the light connections don't supply that amount of current, and the brake connection is are only energized when braking.

Since it uses #10 awg wire, it should be able to handle 25 amps, which is the size of the fuse in the inflator leads.

 

That 10 AWG marking is for that particular ‘pigtail’. I wouldn’t assume that to be the gauge used in your vehicle, at least double check the wiring first! Be safe rather than sorry.

 

I couldn't find any specs for the current supplied to the aux connection in the manual, but I could have missed it.

Does anyone know that information for a 2015 SR5 premium?

EDIT: The fuse box layout shows a 30 amp fuse in the trailer sub battery slot.

 

DC volts/amps wire is very distance sensitive. Thicker wire for more distance. Use a big safety factor. A guage that is okay at 4 feet may not be good at 10 feet for a particular load. Also fuse close to power source. I have seen conflicting data published on line so be careful.

 

A new 88P model with a 7-pin connector showed up recently and they both top out at 20A.

https://viaircorp.com/products/evc88p-digital-portable-compressor?variant=44504677580961

 

Looks like it’s 30A fuse to relay and then straight to the 7 pin socket. I don’t see a reason it wouldn’t then support 30A