When the relay is engergized the common is switched over to the Normally Open contact.Īnother type of relay is the single pole/single throw (SPST). When the relay is off, the common and Normally Closed contacts are connected. Also known as the Bosch relay, the SPDT has a common, movable contact that moves between two fixed contacts, termed Normally Open and Normally Closed. The most common type of relay used in automotive applications is the single pole/double throw ( SPDT). Many automotive relays are similar in appearance and pin configuration and will plug into the same relay socket, but are completely different in the switching duties they perform. It’s important to know a relay’s pin configuration and function before connecting devices to it. The average automotive relay can also handle a much higher current load than a switch (about 30 amps vs. If you use a vehicle’s stock wiring and switches to control aftermarket devices like high-output lighting, relays will not overload or stress the OEM components.Relays allow you to use the proper size fusefor each device, and to place the fuses closer to the battery.If you’re into clean-looking systems, you can use one switch and several relays instead of a bank of bulky switches. Having only one switch to turn off is safer in an emergency, and more convenient as well. Using relays allows you to control a number of devices with a single switch (a master ignition switch on a race car, for example).Combined with the proper gauge wire, this will minimize the voltage drop between the battery and the device, allowing it to function at peak performance levels. shortest wire length) between the batteryand the device(s) controlled by the relay. A correctly wired relay will provide the shortest electrical path (i.e.Why not just use an ordinary on/off switch, you ask? Here are some reasons why relays are better than switches: You can read our earlier post on How Relays Workfor a more detail description of how relays operate. An electro-magnet (also called a coil) is used to pull a set of contacts, or pins, together. One easy way to increase system reliability and performance is by using relaysto switch devices (lights, fuel pumps, fans, etc.) on and off. #30 wire is for 12v constant power.An electrical systemis only as reliable as its components.When the toggle switch is turned OFF to 86 the 87a then becomes ON #87 wire goes to your lights, starter solenoid, fuel pump, or radiator fans.The trigger wire from a toggle switch or thermostat Wiring (Look at the numbers on the relay): Always stop and look at the relay to note the positions of each number on each blade ! ! For example Hella's black 40 amp relays have their #30 constant power in a different position than the Hella blue fused relays, and this socket will fit either of those relays. So if you had four 100w lights using 33.33 amps and your toggle switch is only rated at 10 amp then you could use that 10 amp toggle switch to activate this 40 amp relay and be covered for the 33.33 amps of lights that you're running. For instance if your lights are 100w each then 100w ÷ 12v = 8.33a. If you're using this as a headlight relay, to figure out the amount of amps your lights are using, use the total wattage of your lights and divide that by the volts. Fan relay to take away the amp draw from the ECU or thermostat to your radiator fans.Headlight relay to run a low amp toggle switch with lights that draw up to 40 amps.Hard start relay to get the amp load off of your ignition switch.Typically used with a conventional 20/40 amp relay for: K4 Switches universal relay plug for 4 or 5 prong relays.
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