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2001 Jeep TJ Battery Isolation - Proper Dual-Battery Isolation

Posted in How To on February 18, 2007
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The Wrangler Northwest power products dual-battery relay and cable kit from quadratec allows the batteries to be connected in parallel. Connecting in parallel allows double the battery capacity (amp hours) for your vehicle while maintaining the charge in both batteries.

Dual batteries are a great aid to any vehicle, especially a 4x4 that uses multiple power-hungry devices such as a winch or air compressor. We had previously installed a Kilby dual-battery tray that housed dual Optima batteries in our '01 TJ but had neglected to install a proper battery isolation device. Through installation of the Wrangler Northwest Power Products relay and cable kit, we will be able to start the vehicle using the main battery, but once the engine is running, both batteries are joined for charge and discharge. Also, with the engine off, both batteries are isolated so accessories connected to the second battery won't drain the main battery.

The Wrangler Northwest cable and relay kit includes a 200-amp continuous-duty relay with silver alloy contacts that are said not to stick or corrode. The relay is weather-resistant and will also allow us to install an in-cab battery manager kit at a later time, should we elect to. The cables are made from super-flexible, fine-strand, high-amp copper and are labeled negative (black) and positive (red), and they have predetermined ends with ample length for most underhood installations. All of the cable ends are sealed and strengthened with heat-shrink tubing.

In addition to relay and wire kits, Wrangler Northwest Power Products manufactures a wide variety of single- and dual-battery mounting and wiring options. The company produces single and dual battery trays for most model Jeeps, in addition to battery manager and wiring kits and other items necessary for proper installation. Many of the Wrangler Northwest Power Products systems are available from Quadratec.

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West Chester, PA 19380

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