Roadmaster RM-767 Heavy-Duty Manual Master Battery Disconnect Switch

Safely and instantly disconnect your towed vehicle's battery without tools using the heavy-duty Roadmaster RM-767 Manual Master Battery Disconnect Switch. Designed to eliminate the constant hassle and terminal wear of unbolting battery cables before flat towing, the 767 features a heavy-duty rotary master dial mounted conveniently under the hood or on the frame rail.

Engineered for high-demand applications, the Roadmaster 767 handles up to 300 amps continuous duty and 1,000 amps surge, making it the ideal solution for large gas engines, high cold-cranking amp batteries, and heavy-duty diesel pickup trucks flat-towed behind motorhomes. It isolates the vehicle starter and electrical system while preserving dedicated power leads for supplemental braking systems (such as the Roadmaster InvisiBrake) and breakaway safety circuits.

Key Features & Engineering Highlights:

• Heavy-Duty Rotary Master Dial: Simple turn of the dial completely isolates the battery terminal—no wrenches, no sparks, and no stripped terminal bolts.
• Extreme High-Amp Capacity: Rated for 300 amps continuous duty and 1,000 amps cold-cranking surge, making it fully certified for heavy diesel and high-draw vehicle electrical systems.
• Auxiliary Constant Power Supply: Built-in terminal bypass maintains active power to supplemental brakes, breakaway devices, and towed vehicle monitoring accessories while the starter circuit is isolated.
• Industrial Zinc-Plated & Copper Construction: Built with corrosion-resistant mounting brackets and solid copper electrical terminals to withstand road spray, salt, and severe underhood environments.
• Universal Security Application: Can also serve as a high-security manual battery cut-off switch to prevent parasitic battery drain during seasonal storage and deter vehicle theft.
• Turnkey Professional Installation: Certified in-store installation available at Truck Guy Upfitters (510 W North 1st St, Seneca, SC 29678).

Specifications & Kit Contents:

• Manufacturer: Roadmaster Inc.
• Part Number: 767 (SKU: RM-767)
• UPC: 758306339040
• Continuous Duty Rating: 300 Amps @ 12V DC
• Surge Duty Rating: 1,000 Amps
• Application: Heavy-duty gas and diesel vehicles requiring battery disconnect for dinghy / flat towing, seasonal storage, or anti-theft protection.
• Included: Heavy-duty rotary switch, mounting bracket, heavy-gauge battery cables with crimped copper lugs, terminal boots, hardware, and installation manual.

Note: If your vehicle utilizes dual starting batteries on the starting circuit (common in dual-battery diesel pickups), one 767 disconnect is required per starting battery.