As you can see from the diagram the PIAA 34400 and 34210 are similar. You can tell the difference by the label on the relay. The PIAA 34400 relays are labeled LR-24E and the PIAA 34210 is labeled LR-18. There are also other models that may be similar that add to the confusion however if you have the PIAA 525 or PIAA 550 this is the harness you need. Do not assume compatibility with any model other than the PIAA 525 and PIAA 550. Many models have unique connectors that require model specific wiring harness.

• Pre-assembled, no cutting or splicing
• Includes wire ties for clean install
• Includes double sided tape for mounting switch
• Includes crimp connector for switch power
• Limited Lifetime Warranty

The PIAA wiring harness is designed for easy installation and color coded for proper placing. The harness is durable enough for commercial applications and the backbone of the vehicle's lighting system.