40 Amp Relay and Harness 2-Pack with LED Diagnostic | Air Ride Suspension
Upgrade your air ride suspension system with our heavy-duty 40 Amp Relay and Harness 2-Pack, designed for reliable compressor performance and simplified troubleshooting. Featuring a transparent relay housing with a built-in LED diagnostic indicator, this kit provides instant visual feedback so you can quickly identify electrical issues without wasting time testing circuits.
Whether you’re building a new air suspension system or replacing worn components, these relays are engineered to handle high-current loads while helping protect your pressure switch from premature wear and failure.
Key Features
LED Diagnostic Indicator
The integrated green LED instantly shows when the relay is receiving a trigger signal.
- Green LED ON – Relay is receiving power and operating correctly
- Green LED OFF – Check the switch, fuse, wiring, or trigger circuit
The clear relay housing allows you to visually inspect operation and diagnose problems in seconds.
Protects Your Pressure Switch
Air compressors place a heavy electrical load on pressure switches. This relay acts as a protective buffer, allowing the pressure switch to control the relay while the relay handles the high-current demand of the compressor.
Benefits include:
- Reduced electrical stress on pressure switch contacts
- Improved system reliability
- Extended pressure switch lifespan
Heavy-Duty 12-Gauge Tinned Copper Wiring
Unlike generic relay kits that use thinner wire, our harnesses utilize premium 12-gauge tinned copper wire on the primary power circuits.
Benefits include:
- Improved current flow
- Reduced voltage drop
- Lower operating temperatures
- Enhanced corrosion resistance
Extended 12-Inch Harness Leads
Most standard relay harnesses provide only 5–6 inches of wire, making installation difficult and increasing heat concentration near the relay.
Our 12-inch leads provide:
- Cleaner wiring layouts
- Easier routing and installation
- Improved thermal dissipation
- Professional-grade appearance
Color-Coded Wiring
Simplify installation with directional color-coded leads:
- Red – Power Source
- Gray – Compressor Output
- Black – Ground
- White – Pressure Switch Trigger
No confusion. No guesswork.
Why Choose Tinned Copper?
Air ride systems naturally generate moisture inside air tanks. Standard copper wiring can oxidize over time, reducing conductivity and causing electrical issues.
Our tinned copper wire provides superior corrosion resistance and long-term reliability, making it ideal for demanding air suspension applications.
Specifications
- Voltage: 12V DC
- Current Rating: 30/40 Amp
- Relay Type: 4-Pin SPST (Single Pole Single Throw)
- Wire Type: UL 1015 Tinned Copper
- Power Leads: 12-Gauge
- Trigger Leads: 16-Gauge
- Harness Length: 12 Inches
Package Includes
- (2) 40 Amp Clear LED Diagnostic Relays
- (2) Heavy-Duty 12-Inch Relay Harnesses
Designed for air ride suspension systems, onboard air setups, and compressor applications where reliability, durability, and easy troubleshooting matter.