Speedwire Systems - Electrical Systems Built for Racers by At Speedwire Systems, our goal and vision is to refine and simplify vehicle chassis electrical control and installations, helping our customers to build consistent and reliable race-winning vehicles. Our products allow racers to spend their time on their race program rather than debugging electrical issues.Products · Switch Panels · Instructions · Contact · Eight Relay Controller · Six Relay Controller Painless Pro Street/Drag Race Wiring Harnesses | JEGS Wiring Harnesses for Winning Racers Why start at square one when a complete wiring harness from Painless Performance is ready to go? The last thing you need to worry about at a race is a wiring problem. Save time to work on other parts of your racecar. Make sure it is done right with a Painless Wiring Harness.