Ignitions and Electrical› Charging Systems

True Amps

12V 140A Dual Battery Isolator Kit

$132.95

SKU: DBK12LRG-GMC

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The True Amps DBK12LRG-GMC is a 12V 140A dual battery isolator kit designed for GMC Sierra trucks. It features automatic smart battery management, ensuring your primary starting battery remains charged while an auxiliary battery powers accessories.
Show original supplier description
The True® GMC Sierra Dual Battery Kit is a heavy-duty 12V 140A battery management system engineered specifically for GM trucks. This kit enables you to power auxiliary systems like winches, lights, and refrigerators without draining your main starting battery, preventing you from getting stranded. It utilizes a 140A Voltage Sensitive Relay (VSR) that automatically engages at 13.3V to charge both batteries when the engine is running and disengages at 12.8V when the engine is off, effectively isolating the starter battery.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandTrue Amps
Part NumberDBK12LRG-GMC
CategoryIgnitions and Electrical
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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