Relays are used anytime you need to switch a high-current accessory via a low-current output. For example, you’d like to turn on an electric fan via one of the programmable outputs of your aftermarket EFI system. No problem. Solenoids are simply SPST relays that can switch very high current loads. They’re perfect for auxiliary battery installations, remote battery disconnects, or switching very high current accessories.
Need to brush up on your skills with relays? No problem. Chapter 4 of Automotive Wiring and Electrical Systems covers relays–and how to put them to work–in-depth.
The Basics

- SPST – Single Pole Single Throw
- SPNO – Single Pole Normally Open
- SPDT – Single Pole Double Throw
- C – Common
- N.O. – Normally Open
- N.C. – Normally Closed
Over the years, we’ve used nearly every brand of relay and solenoid you’ve heard of (and some that you haven’t). Our selection is based on the ones that we’ve experienced the best service from.
Relays & Relay / Socket Kits
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GEP / Hella 40/20 Amp Waterproof Relay Kit
$23.95 Select options -
Hella 40/20 Amp Waterproof Relay with Bracket
$12.95 Add to cart -
Sale!
Hella 40/20 Amp Waterproof Relay with Socket
$23.95$21.95 Add to cart -
Song Chuan 50/30 Amp Relay with Interlocking Socket
$14.95 Add to cart -
Song Chuan 50/30 Amp Relay with Socket
$10.95 Add to cart -
Song Chuan 50/30 Amp SPDT Relay
$7.95 Add to cart -
Song Chuan 50/30 Amp SPDT Relay – No Bracket
$7.45 Add to cart -
Song Chuan 70 Amp SPST Relay
$10.95 Add to cart -
Song Chuan 70 Amp SPST Relay – No Bracket
$8.95 Add to cart -
Song Chuan 70A SPST Relay with Socket
$16.95 Add to cart -
Tyco / Bosch 30/20 Amp Relay
$6.95 Add to cart -
Tyco / Bosch 30/20 Amp Relay with Interlocking Socket
$12.95 Add to cart -
Tyco / Bosch 30/20 Amp Relay with Socket
$8.95 Add to cart -
Tyco 40/30 Amp Relay
$8.95 Add to cart -
Tyco 40/30 Amp Relay with Interlocking Socket
$14.95 Add to cart -
Tyco 40/30 Amp Relay with Socket
$10.95 Add to cart
Relay Socket Kits
Pre-Wired Relay Sockets that Don’t Suck
Most pre-wired relay sockets simply aren’t worth buying because the terminals are low quality and the gauge of wire undersized. For that reason, we hand build our own relay sockets with tin plated OEM quality terminals, 16 AWG GPT for the coil connections, and 10 AWG TXL for the switch connections. In addition, we crimp and solder the 10 AWG switch wires to ensure low resistance and excellent reliability.
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4-Wire 70A Relay Socket
$10.95 – $17.95 Select options -
4-Wire 70A Relay Socket with Diode Protection
$11.95 – $18.95 Select options -
4-Wire Relay Socket
$8.95 Add to cart -
4-Wire Relay Socket with Diode Protection
$9.95 Add to cart -
4-Wire Waterproof Relay Socket
$15.95 Add to cart -
4-Wire Waterproof Relay Socket with Diode Protection
$16.95 Add to cart -
5-Wire Relay Socket
$9.95 Add to cart -
5-Wire Relay Socket with Diode Protection
$10.95 Add to cart -
5-Wire Waterproof Relay Socket
$16.95 Add to cart -
5-Wire Waterproof Relay Socket with Diode Protection
$17.95 Add to cart
Relay Socket Terminals
Spare terminals for all of the relay / socket kits that we offer.
ISO 280 Series Relays
Perfect for our Waterproof Power Distribution Centers!
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20A Song Chuan 280 Series SPST Relay
$6.85 Add to cart -
35A Song Chuan 280 Series SPDT Relay
$6.95 Add to cart -
35A Song Chuan 280 Series SPDT Relay with Diode
$8.95 Add to cart -
35A Song Chuan 280 Series SPST Relay
$6.95 Add to cart -
35A Song Chuan 280 Series SPST Relay with Diode
$8.95 Add to cart -
50A Song Chuan 280 Series SPDT Relay
$7.95 Add to cart -
50A Song Chuan 280 Series SPDT Relay with Diode
$12.95 Add to cart -
50A Song Chuan 280 Series SPST Relay with Diode
$9.95 Add to cart
Solenoids
Available up to 500A for the highest current switching needs!