Log in or Sign up

Welcome to Tundras.com!
You are currently viewing as a guest! To get full-access, you need to register for a FREE account.
As a registered member, you’ll be able to:

Participate in all Tundra discussion topics

Transfer over your build thread from a different forum to this one

Communicate privately with other Tundra owners from around the world

Post your own photos in our Members Gallery

Access all special features of the site
Quick Links: Lost the bolt in the butt Kenwood/Pioneer/Alpine Head Unit? 12v outlet install in bed? Wiring aftermarket fog lights 01 Access Cab Trailer lights wiring? Plug and play remote start

Second battery in 3rs gen?

Discussion in 'Electrical' started by Reubenski, Feb 28, 2025.

Post Reply

Feb 28, 2025 at 2:53 PM

#1

#1
Reubenski [OP] New Member

Joined:

Jan 14, 2019

Member:

#24474

Messages:

132

Gender:

Male

Vehicle:

2025 Limited CM, TRD Off-road package, 3" lift

I had a Genesis Off-road dual battery setup with a battery isolator in my old Tundra. It is a really slick system but they don't make them for the 3rd gen. For a non-hybrid, anyone come up with a slick solution to have an accessory battery that can isolate or charge off the alternator?

Reubenski, Feb 28, 2025

#1

Post Reply

Register FREE to Reply!

Products Discussed in

Maestro Acc-SAT-TO2 Sat Radio and GPS Antenna adaptors for TO2 Vehicles

DEKIEVALE 22 Gauge 5 Conductor Electrical Wire, 16.4FT 22AWG Black PVC Stranded Tinned Copper 5 Wire Cable, 22/5 Extension Cable for LED Lamp Lighting, Automotive, Speaker, Access Control, etc.

Start-X Complete Remote Starter kit for Toyota Tundra (2010-2017) | Key Blade Start Engine | G-Key | Zero Wire Splicing | Plug N Play | 2010 2011 2012 2013 2014 2015 2016 2017

Curt Manufacturing CURT 55378 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Toyota Tundra , Black

Newport Trolling Motor Smart Battery Box Power Center with USB and DC Ports

Dual Battery Isolator Kit - 12 Volt 140 Amp Voltage Sensitive Relay - Complete VSR Double Battery Automatic Charger - Fits Trucks, ATV, SUV, UTV Boats and More - Safe, Water and Vibration Resistant

EWCS 2 Gauge Premium Extra Flexible Welding Cable 600 Volt - Red - 25 Feet - Made in The USA

Nilight NI04-200W 1PC LED 41" 200W Spot Flood Combo Single Row 19000LM Off Road 3D Fog Driving Roof Bumper Light Bars for Jeep Ford Trucks Boat, Black

25ft - 1/2" PET Expandable Braided Sleeving – BlackRed – Alex Tech Braided Cable Sleeve

bbfly-B6 OBD2 Splitter 16 Pin OBD II Splitter Extension 1x Male and 2X Female Extension Cable Adapter (1FT/30CM) (1Pack)

OLLGEN OBD2 Splitter Cable,OBD-II Extension Cable,1 Male to 3 Female Car Diagnostic Extender Cord Adapter,16 Pin Right Angle,1.6ft/50cm

BUNKER INDUST 10-Way Fuse Box Blade Fuse Block Holder with LED Indicator for Blown Fuse Waterpoof Protection Cover for Car Boat Marine Automotive,Include 20Pcs Blade Fuses and 1Pcs DIY Sticker

ARB 10900028 Threaded Socket/Surface Mount Outlet

Renogy 20A Male and Female Connector Waterproof in-Line Holder w/Fuse, 20A, Black

ELECFUN Waterproof Heat Shrink Tubing Kit 365 pcs, 3:1 Dual Wall Tube - Adhesive Lined Heatshrink for Wires - Marine Grade and Industrial Shrinkable Wiring Wrap Fully Insulation Black/Red, 7 Sizes

BioFuse 12 AWG Low Profile Mini ATT Quick TAP KIT: 2 Add-A-Circuit Car Fuse Tap Adapters, 2 Each (10A 20A) LP-Mini Blade Fuses, 4 Zip Ties + Fuse Puller

Hilitchi Professional Insulated Wire Terminals Connectors Ratcheting Crimper Tool for 22-10AWG

DAMAVO USB Type C Charger, 5V 3A, Compatible with iPhone 12/Mini/Pro/XR/Xs/Max/X/11/10/9/8/7/6/Plus, iPad Pro/Air 2/Mini, Galaxy, LG, HTC and More

TEMCo Hammer Lug Crimper Tool - Crimps 8 AWG to 4/0 Battery & Welding Cables (Workbench-Mountable)

iGreely 10AWG SAE to SAE Quick Disconnect Wire Harness - 10Ft Solar Panel Extension Cable for Trolling Motor, Automotive, RV, Motorcycle, Cars, Tractor

Klein Tools 1019 Klein Kurve Wire Stripper / Crimper / Cutter for B and IDC Connectors, Terminals, More

Posi-tap Connectors, 20-22 Gauge Wire, Bulk Pack of 20

Klein Tools 11061 Self-Adjusting Stripper / Cutter, Heavy Duty, for 10-20 AWG Solid, 12-22 AWG Stranded, and Romex Wire 12/2 and 14/3

Splice Kits, 8 to 2 Awg, 221F, Blk, 600V

Mroinge 6V / 12V 1.5A Fully Automatic Trickle Battery Charger/Maintainer for Automotive Vehicle Motorcycle Lawn Mower ATV RV Powersport Boat, Sealed Deep-Cycle AGM Gel Cell Lead Acid Batteries

ZhiYo 50 FT 1/2” Wire Loom Split Tubing Auto Wire Conduit Flexible Cover Plastic Cover for Electrical Wires & Cables High Temperature (-40F to 257F)

LeMotech Project Box ABS Plastic IP65 Waterproof Dustproof Electrical Junction Box Outdoor Enclosure for Electronics Black 11.41" x 8.26" x 3.93" (290 x 210 x 100mm)

Taukealugs AWG 8 Gauge UL1015 Battery Power Tinned Oxygen Free Copper OFC Welding Cable Wire Red Black-Total 20FT and Lugs Terminal Connectors with Heat Shrink Tube

Allstar Performance Battery Tray, Lightweight, 12 in Length x 7.25 in Wide, Frame Hooks, Hardware Included, Steel, Natural, Kit

Hozan Crimping Tool (For Open Barrel Type Contact) Crimping Pliers Die Part with Steps, Thin Finish AWG #28 - #14 P-706

True Mods 12V Auto Waterproof Fuse 5-Pin Relay Box Block Kit w/ 12AWG + 16AWG Pre-Wired Harness [Bosch Style Relays & Fuses] Universal Relay Panel for DC Automotive Vehicles Cars Marine Boat Jeep UTV

Nilight Led Light Bar Amber 31" 150W Super Slim Spot Flood Combo 14500LM 3D Driving Fog Off Road Lights for Trucks Pickup SUV ATV UTV Boat 4x4 Van Camper-2 Style Mounting

HELLA 996152131 12V Delay-On-Release, Time Delay Relay, Black

12V Submersible Water Pump (2GPM / 16ft.) | Works with Microswitch 12V Faucets | 12 Volt Small Water Transfer Pump For RV, Jerry Can, Camping, Pond, Boat | German Made

ENGINEER Precision Universal Crimping Tool with Inter-Changeable die Plates (Size S) Handy Crimp Tool. Made in Japan. pad-11

8 Gauge 8 AWG 37.5 Feet Red + 37.5 Feet Black Welding Battery Pure Copper Flexible Cable + 10pcs of 3/8" Tinned Copper Cable Lug Terminal Connectors + 3 Feet Black Heat Shrink Tubing

15A Weatherproof Outdoor Power Outlet by Journeyman-Pro 15 Amp 125 Volt NEMA 5-15R Receptacle Kit with Integrated 20" Inch Extension Cord + Waterproof Rubber Cover (GCR1-BLACK)

Striveday 16 AWG 3 Conductor Wire Power Cable Audio Cable Signal Line (Red & Black & Yellow) 33ft UL Certification

Thread Checker SWTC-26 Nut & Bolt, Inch & Metric, Original Version

Fastronix Top Post Military Spec Battery Terminal and Cover Kit

iCrimp Cable Lug Crimping Tool for Heavy Duty Wire Lugs, Battery Terminal, Copper Lugs AWG 8-1/0

Pyle Portable PA Speaker - All-Weather Mono Trumpet Horn Speaker, 5” Outdoor PA System with 25W Peak Power, 8 Ohms Impedance, 180° Adjustable Swiveling Bracket for Easy Maneuverability