MCS Adventures Power Bar Battery Tap with Relay – 15A Key-On Accessory Adapter Harness Compatible with Polaris Pulse Bar – Plug & Play Fuse-Saving Upgrade

Tired of Blowing Your OEM Key-On Accessory Fuse? If you’re running multiple accessories from your vehicle’s factory key-on power source, you’ve probably dealt with blown fuses, weak performance, or unreliable power. The MCS Adventures Power Bar Battery Tap with Relay is the simple plug-and-play fix designed to give your high-draw accessory the power it needs—without stressing your OEM circuit. What It Does This harness installs inline between your accessory bar and your accessory plug, converting one existing key-on outlet into a relay-driven 15 amp key-on power source. Instead of pulling high current through the factory fuse, it draws power directly from the battery and uses the key-on signal to switch the accessory on and off properly. Why This Harness Works Better Many aftermarket accessory wiring kits include a relay—but they’re often wired incorrectly and don’t properly isolate the key-on circuit. This harness uses a correct 3-wire relay design to provide clean power delivery and dependable ignition-triggered operation. Perfect For Light bars Radios GPS units Additional lighting 12V accessories and add-ons Fuse & Wiring Notes (Important) This harness includes two fuse holders: Yellow fuse holder: relay coil trigger power (5A max recommended) Black fuse holder: main output protection (ships with 15A) Installer responsibility: Ensure the wire size used matches the fuse rating. We recommend 14-gauge wire for 15A. If your accessory uses smaller wire, replace the 15A fuse with a properly sized fuse: 16ga wire: 7.5A recommended (10A max) 18ga wire: 5A recommended (7.5A max) Stop overloading your OEM circuits—protect your fuse and power your gear properly.

• Stops Blown OEM Key-On Fuses – Offloads high-draw accessories from the factory key-on circuit to prevent repeated fuse failures and power dropouts.
• True 15A Key-On Power Output – Converts one existing key-on accessory outlet into a dedicated 15 amp key-on outlet (center terminal) for demanding accessories. Simply inserts in between power bar and the accessory.
• Proper Relay-Driven Design (3-Wire Relay Setup) – Pulls power directly from the battery and switches it using the vehicle’s key-on signal for clean, reliable operation.
• Plug-and-Play Installation – Installs inline between your accessory plug and the OEM power bar system with no cutting, splicing, or rewiring required.
• Accessory-Friendly Upgrade – Ideal for light bars, radios, GPS units, extra lighting, and other 12V accessories that overload factory circuits.
• Dual Inline Fuse Protection – Includes two fuse holders: one for relay trigger power (yellow) and one for main accessory output (black, ships with 15A).
• Important Fitment Note – Works ONLY with an existing accessory plug wired for KEY-ON power (center terminal). Accessory bar not included.