If you’re looking to upgrade your air system for faster fills, more reliability, and greater efficiency, running dual air compressors is one of the smartest choices you can make. By wiring two compressors correctly, you can extend the life of your system while ensuring your air tank fills quickly and consistently. Whether you’re powering an air ride suspension, heavy-duty air horns, or off-road accessories, this step-by-step guide will walk you through the basics of wiring dual air compressors safely and effectively.
Why Choose Dual Air Compressors?
Before we dive into the wiring, it’s important to understand why dual compressors are worth the investment. With two compressors, the workload is divided, meaning each one runs less often and doesn’t overheat as easily. This improves overall efficiency and extends the lifespan of both compressors. Plus, in case one fails, you have a backup to keep your system running.
What You’ll Need
To wire dual compressors properly, gather the following:
Two matching compressors (recommended for balanced output)
Pressure switch rated for dual setups
Relays (one per compressor) or a dual relay harness
Heavy gauge wiring (to handle current draw)
Inline fuses or circuit breakers
Check valves
Connectors, crimpers, and electrical tape
Having everything ready before you start will save time and prevent mistakes.
Step 1: Mount the Compressors
Secure both compressors in a well-ventilated area, away from direct heat or excessive moisture. Proper mounting not only ensures performance but also prevents damage during operation.
Step 2: Install Check Valves
Each compressor should have a check valve installed. This prevents one compressor from backfeeding into the other, which could cause damage or reduce efficiency.
Step 3: Connect Power from the Battery
Run a heavy-gauge wire from your battery’s positive terminal to each relay. Be sure to include an inline fuse or circuit breaker close to the battery to protect your wiring and system.
Step 4: Wire the Relays
Each relay controls one compressor. A standard relay setup includes:
Pin 30: Connect to the fused power from the battery.
Pin 87: Connect to the compressor’s positive terminal.
Pin 85: Connect to ground.
Pin 86: Connect to the signal from the pressure switch.
This setup ensures your compressors only activate when needed.
Step 5: Ground the Compressors
Connect each compressor’s negative terminal directly to the chassis or, for best performance, run a dedicated ground wire to the battery’s negative post.
Step 6: Install and Wire the Pressure Switch
The pressure switch monitors tank pressure and signals the relays when to turn on or off. Wire it to control both relays so both compressors activate at the same time when the system needs air.
Step 7: Test the System
Double-check all connections, ensure your fuses are in place, and power up the system. Both compressors should kick on together when tank pressure drops and shut off once the desired pressure is reached.
Final Thoughts
Wiring dual compressors may seem intimidating, but by breaking it down step by step, it becomes a straightforward project. For a detailed guide with diagrams and expert instructions, check out DUAL AIR COMPRESSORS and make your air system run stronger, faster, and more reliably than ever.