Universal 12V Accessory Wiring Harness & 30A Relay Kit with Circuit Breaker

• Universal 12V accessory wiring solution - Suitable for electric fuel pumps, electric water pumps, auxiliary lighting, horns and other compatible 12V accessories in hot rods, classic cars, muscle cars, custom vehicles and 4WDs.
• 30 amp relay and circuit protection - Includes a 30A relay and 30A circuit breaker to provide reliable switched power while reducing electrical load on dashboard switches and factory wiring.
• Complete heavy-gauge wiring kit - Supplied with a 100" wiring harness, pre-wired relay connector, crimp terminals and installation hardware for a neat, straightforward installation.

Download Instructions

The GASO Universal 12V 30 Amp Relay & Wiring Harness Kit provides a convenient solution for powering aftermarket electrical accessories in hot rods, street machines, muscle cars, classic vehicles, custom builds and 4WDs. Designed for high-performance electric fuel pumps, this versatile kit can also be used with a wide range of compatible 12V accessories that require a dedicated, relay-controlled power supply.

By using a 30 amp relay to switch power directly from the battery, the kit allows a low-current ignition signal, dashboard switch or suitable accessory controller to operate higher-current electrical equipment without passing the full accessory load through the control switch. The supplied 30 amp circuit breaker provides overload protection, while the heavy-gauge wiring supports dependable power delivery.

The pre-wired relay connector and included terminals simplify installation, while the special nesting connector design allows multiple compatible relays to be mounted neatly together for a clean, professional finish.

Common Applications

• Electric fuel pumps - Ideal for our GPP-1001 and GPP-1002 electric fuel pumps fitted to carburetted engines, performance vehicles, hot rods and custom fuel systems.
• Electric water pumps - Provides relay-controlled power for compatible aftermarket electric engine cooling and circulation pumps.
• Electric radiator cooling fans - Can be used with suitably rated electric cooling fans controlled by a thermostatic switch or compatible fan controller.
• Auxiliary driving lights and spotlights - Suitable for compatible aftermarket driving lights, spotlights, fog lights and custom lighting installations.
• Electric horns and air horns - Provides switched power for compatible high-output horns, chrome trumpet horns and air horn compressors.
• Air conditioning accessories - Can be used for compatible aftermarket air conditioning compressor clutch circuits and auxiliary electrical components.
• Air suspension compressors - Potentially suitable for smaller, appropriately rated air suspension compressors and custom airbag suspension installations.
• Electric vacuum pumps - Suitable for compatible vacuum pump power circuits, including systems used with modified engines, subject to the pump manufacturer's control and safety requirements.
• Nitrous system accessories - Can provide switched power for compatible nitrous bottle heaters and auxiliary components when used with the required safety and control devices.
• General 12V custom accessories - Suitable for other compatible relay-controlled electrical equipment in vehicle restorations, performance upgrades and custom automotive installations.

Specifications

• Brand: GASO
• Type: Universal 12V automotive relay and wiring harness kit
• Operating voltage: 12V DC automotive electrical systems
• Relay rating: 30A
• Circuit breaker rating: 30A
• Circuit breaker type: Automatic reset
• Harness length: 100" (approximately 2540mm)
• Wire gauge range: 10-18 gauge
• Main power supply wire: 10 gauge
• Accessory power wire: 12 gauge
• Relay trigger wire: 18 gauge
• Relay ground wire: 18 gauge
• Relay connector: Pre-wired, nesting design
• Applications: Compatible 12V automotive electrical accessories
• Vehicle suitability: Hot rods, muscle cars, classic cars, street machines, custom vehicles and 4WDs

Kit Includes

• 1 x 30 amp relay
• 1 x 30 amp automatic-reset circuit breaker
• 100" heavy-gauge wiring harness
• Pre-wired relay connector
• Crimp terminals
• Installation hardware

Features

• Universal design for a wide range of compatible 12V automotive accessories.
• Provides a dedicated relay-controlled power circuit for aftermarket electrical equipment.
• Reduces high-current electrical load through dashboard switches and original vehicle switchgear.
• Heavy-gauge power wiring for reliable current delivery.
• 30 amp circuit breaker provides overload protection and automatically resets after cooling.
• Can be triggered by a fused ignition-switched supply, suitable dashboard switch or compatible accessory controller.
• Pre-wired relay connector helps simplify installation.
• Special connector allows additional compatible relays to be nested together for a cleaner installation.
• Ideal for custom wiring, restorations, performance upgrades and aftermarket accessory installations.

Installation Notes

• Suitable for 12V DC automotive electrical systems only.
• Accessory running current, start-up current and duty cycle must be compatible with the relay, circuit breaker and wiring capacity.
• Some electric cooling fans, air compressors and other high-current accessories may require a higher-rated relay, different circuit protection or dedicated wiring.
• The relay trigger must be connected to an appropriately fused 12V control circuit.
• Mount the circuit breaker close to the power source and route wiring away from excessive heat, sharp edges and moving components.
• Additional thermostatic switches, pressure switches, controllers or safety devices may be required depending on the application and are not included.
• For electric fuel pump installations, retain any manufacturer-required safety shut-off provisions.