5-pin SPDT (single pole, double throw) automotive relay.

Relays are essentially two parts in one package. The first part is an inductive coil (pins 85 and 86). This coil is the “trigger” function of the relay. By applying both a positive (+) and ground (-) to the contacts, current passes through the coil. When current passes through the coil, a magnetic field is generated and moves the switch (the arrow in the diagram). This is where the second part of the relay comes into play.

The second part of the relay is the “switch.” The switch has three interface contacts—common, normally closed, and normally open. “Normally” refers to the state of the relay not being energized.

While relays can be used for virtually any task, there are some very useful, simple applications for adding LED lighting to a vehicle. Please note that this wiring only pertains to the relay—not the wires in the vehicle. Before interfacing with a wire in a vehicle, always ensure you test the wire with a digital multimeter first to confirm circuit function.

Positive Switching

Positive switching is used for applications where the “trigger” for your switch or circuit is positive. This could be an ignition, brake, or reverse light wire for example.  This could be used for applications such as off-road light bars, work lights, additional brake lights, and other exterior lighting.

Negative Switching

Negative switching is used for applications where the “trigger” for your switch or circuit is negative. Negative triggers are often found in door, hatch, and trunk triggers as well as many interior switches. This could be used for applications such as footwell lighting, truck bed lighting, under-hood lighting, and other interior lighting.

Switch Activated With Ignition Override

This is useful for applications where you want to turn your light on or off with a switch but only want the light to remain on when the car is running or key is in the “ignition” position. The main advantage to this is—even if the switch is left on—the light (or output circuit) will shut off when the key is turned off so that the battery will not be run down.

For technical questions, don’t hesitate to call us toll free at 866-590-3533. Our customer service and technical support teams are available from 8:30 a.m. to 8 p.m. CDT Monday-Thursday and 8:30 a.m. to 4 p.m. CDT on Friday.

Now that the weather is warming up, you'll have more time to get those household jobs you've likely been putting off done. There'll likely be lots of trips to the hardware store, power tools, shouts of victory and the occasional groan of defeat along the way as you undergo a renovation. Before you launch into your summer projects here are a few tips to make sure you have a productive home improvement season.

Do your homework

Research your project before you start by finding stories and reading product reviews. Doing your due diligence on a job before you even pull out a tape measure will help to prepare yourself mentally.

Stick to the plan

Before you start knocking down, peeling off, unscrewing or disconnecting, make sure you have a clear plan of what you want to do and how you want to achieve it. The last thing you want is to turn a two hour job into two day patch-up.

Measure twice, cut once

Not being meticulous about your measurements often leads to "an inch off here" or "an inch to much there," which is all you need to ruin a great day's work.  Making sure you get the right size pipes, joints and parts the first time you go will save you multiple trips to the hardware store.

Get the right tool

Much like the previous point, using the wrong tool can lead to you undoing your hard work. We've all been tempted to jury rig something that's "close enough" to what we want, but that sometimes turns out to be not just unwise but also unsafe.

Have a backup plan

Ceiling fans are sometimes looked over when decorating a home. Besides of freshening a room, fans complete a room design and composition. It’s important to understand how size and height affect the fan’s efficiency and overall look of a room. A ceiling fan that’s too big will overpower the room’s design and visually pull the ceiling downwards; a fan that’s too small won’t properly circulate the air.