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Old 09-27-2020, 12:06 PM #1
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Second battery install

Has anyone here installed a second battery on the passenger side behind the air filter box? If so, what size will fit and what parts are needed to actually install this? Going into a 2016 TRD Pro with a TRD CAI.
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Old 09-27-2020, 02:20 PM #2
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C4 Fab makes a nice box to mount a second battery in that location. You'd have to check their website to see what fits but something like a Group 34 fits in that spot as I had one there on my 4th gen.

As far as what else you need, I'd look at a Blue Sea ML-ACR for switching and then if you use an AGM, you'll need a DC-DC charge booster. Cabling etc. There's tons of shit written up about this as it's been a popular mod for decades.
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Old 09-27-2020, 03:15 PM #3
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I did this kit, using this video as a guide. It took me 2 days due to frequent pauses for back pain. Easy install:

'10-Current Toyota 4Runner SDHQ Built Complete Dual Battery Kit

An idiot?s guide to a dual battery setup on 4Runner - YouTube
Attached Images
Second battery install-20200927_142029_hdr-jpg  Second battery install-20200927_142014_hdr-jpg 

Last edited by mizzougrad01; 09-27-2020 at 04:21 PM. Reason: Updated website and pics
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Old 09-27-2020, 06:14 PM #4
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Here is a link to my install:

https://www.toyota-4runner.org/3172443-post77.html
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Old 09-28-2020, 02:44 AM #5
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Here's a pretty damn fine thread on dual battery options

Dual Battery Systems
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Old 09-28-2020, 11:05 AM #6
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Follow the above links for info....

FWIW, I have the C4 Fab battery tray and am using a Northstar 27F AGM... I don't think anything even slightly longer than the 27F would fit; I'm using a Battery Doctor 150A battery isolator to isolate/combine the two batteries and a ArcLight voltage booster. I ran 1AWG between each battery and the isolator. and am using Blue Sea MRBF fuses at each battery. Current flows from the second battery to 2 separate Blue Sea ST Blade distribution blocks under the hood (a 6 outlet and 12 outlet, one on each side), a 6 outlet ST Blade block under the dash (through a relay to create switched power), and to a 12 outlet ST Blade block in the cargo area for power to all the relays in the back and all the outlets/rear powered accessories.

Since I have a fridge that lives in the truck and the truck regularly sits for a few days at a time in my driveway I'm also running a Victron 15A AC-DC charger and plug the truck in anytime I'm at home and have the ability to plug in a portable 120W solar blanket in the event we are at a campsite for more than a day or two (campground style)
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Last edited by Anand; 09-28-2020 at 11:11 AM.
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Old 09-28-2020, 11:29 AM #7
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Thanks for the info so far everyone. Just as an FYI, I am running a X2Power/Northstar 31M now as my primary with the ArcLight voltage booster. I may be able to get a second AGM battery for free, so I was considering dropping it into the passenger side and set it up for the moment until I can decide what else I want to run off it, I have been considering getting a frig.
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