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Old 05-16-2021, 11:51 PM #31
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12v / USB Power - how to make always hot?
I thought about this long and hard and why not just connect a battery bank inline with your existing switched outlets?

Will store power but not let your car die if left too long. I’m sure there are ways to conceal it or make the dash outlets be the output of the battery.


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Last edited by 2021nightshade4x4; 05-17-2021 at 12:11 AM.
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Old 05-17-2021, 10:29 AM #32
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Quote:
Originally Posted by 2021nightshade4x4 View Post
I thought about this long and hard and why not just connect a battery bank inline with your existing switched outlets?

Will store power but not let your car die if left too long. I’m sure there are ways to conceal it or make the dash outlets be the output of the battery.


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I'm having trouble understanding your question, are you asking why not just turn your starting battery into a battery bank for additional capacity?
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Old 05-17-2021, 11:15 AM #33
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Originally Posted by jhguth View Post
I'm having trouble understanding your question, are you asking why not just turn your starting battery into a battery bank for additional capacity?

Car USB into one of these... then phone plugs into this:




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Old 05-17-2021, 11:42 AM #34
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Quote:
Originally Posted by Blake_Runner View Post
I'm trying to do this on my 2012, but I think my fuse box layout is different than the 14+. Does anyone know what fuses I should jump between? Thanks!
Did this with my 2010 LE and works great. Make sure you're installing the fuses correctly in the add-a-circuit. I had to move them one or two times before it started working. An easy indicator could be to plug a phone charger in and listen for your phone to chime that it's charging, or something with a light that you can see from the floor.
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Old 05-17-2021, 12:33 PM #35
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Take a look at this for more details. Post #17,
Rear 12v outlet | Toyota 4Runner Forum [4Runners.com]
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Old 07-11-2021, 04:07 PM #36
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In case it hasn’t been posted on here, I think I figured out how to do this on a 2021 (and presumably 2020). Do the add a circuit trick - between IGN NO 3 and P/OUTLET under the dash. Then under the hood, remove the relay labeled ACC NO 3, make up a small jumper and jump the two contacts where the copper terminals on the relay would plug in. I don’t believe this powers the rear seat usb outlets - I’m guessing those are fed from P/OUTLET NO 2 under the hood.
It doesn’t appear anything other than the outlets come on, but I’ll confirm that over the next few days.
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Old 07-11-2021, 04:15 PM #37
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Old 07-12-2021, 06:11 PM #38
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So, it appears jumping the ACC NO 3 relay under the hood completes the circuit for just the front power outlets on the 2021 Runner to remain always on.

Glad this worked as I had already extended wiring from the aux battery fuse block to the interior fuse block for this.
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Old 07-13-2021, 02:40 AM #39
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I did this on a 2017 and the radio is also turning on. It was great for the drive in but in general I need to figure out how to just get the rear accessory 12v to be constant. Anyone figure out why this is happening?
Apparently I’m quick to work and slow to read. I’ll try again tomorrow with the direction of the add a circuit in mind.
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Old 04-27-2022, 04:37 PM #40
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Quote:
Originally Posted by ElectroBoy View Post
Take a look at this for more details. Post #17,
Rear 12v outlet | Toyota 4Runner Forum [4Runners.com]
thx @ElectroBoy !!! Had seen this on @jicko thread but couldn't see the fuse box in my head when I got upside down ! Coffee in bed now
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Old 08-11-2022, 04:51 PM #41
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Quote:
Originally Posted by woodsby View Post
So, it appears jumping the ACC NO 3 relay under the hood completes the circuit for just the front power outlets on the 2021 Runner to remain always on.

Glad this worked as I had already extended wiring from the aux battery fuse block to the interior fuse block for this.
Any idea what to jump to get constant power to the rear 12v and 120v outlets?
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Old 08-11-2022, 08:44 PM #42
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Any idea what to jump to get constant power to the rear 12v and 120v outlets?
Not sure, but maybe try jumping the acc 2 relay.
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Old 08-12-2022, 04:05 PM #43
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So, I was sort of successful last night.

I jumped the ACC 3 relay under the hood and also had to send a constant hot to the P/Outlet fuse in the fuse box underneath the steering column (jumped from the power seat fuse). The result is that all 12v cig lighter outlets in the car are now constant hot. This includes the one in the rear of the car. The 120v outlets and USB ports are still only working when the engine is running.

But this mod is allowing me to run a refrigerator independent from the engine, which is handy. I did a 12 hour test last night and zero issues with excessive battery drain in that time period. I also have a 2-battery Genesis kit going in next week.
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