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.

Once you have decided on using prefabs, the best approach starts with an honest assessment of available skills, facilities and tools. In addition, the contractor will have to decide on whether to carry out the prefab work in-house. Other options include a third party’s workshop.

If lacking in the required skills or other requirements, the contractor will have to either train or hire the right staff and acquire all the tools for implementing the project to completion. All these costs will affect profitability and should be considered.

Clear communication before and during the construction phase is essential for the success of prefabrication. The contractor should coordinate with building owner, suppliers, partners and contractors in other fields.  This ensures a smooth project flow. It should be simple to make adjustments as needed.

For the prefab process to succeed, the contractor should pay attention to the following:

To audit or not to audit? This can be a simply answered question when you consider the array of benefits gained from an energy audit. The switch to more energy efficient solutions could really be a benefit for your business.

An energy audit is an in-depth, outside to inside, room-by-room examination of your business’ current energy efficiency levels and usage practices. Taking this information and the level of savings you’d like to achieve into account, a customized plan can then be developed, focusing on cost-effective solutions for maximizing functionality and efficiency while minimizing your business’ energy usage and expenses.   

A professional audit pays for itself, offering you the opportunity to discover the most effective ways to cut operating costs through energy efficient improvements. How much can it save? The average commercial building wastes thirty percent of its energy dollars, meaning an investment in efficiency can return, on average, $1.50 for every dollar invested.  

By identifying and rectifying potentially dangerous problems, particularly in older buildings, auditors can detect possible health and safety risks such as carbon monoxide from improperly operating or improperly vented combustion equipment, radon leaks, and more.

Improvements in insulation and air sealing reduce heat transfer, leading to a more stable, efficiently heated and cooling space. This increased comfort through an improved thermal envelope can lead to not only increased productivity, but also a reduction in utility costs for you.

Energy audits not only protect the environment by reducing fossil fuel pollution, but also ensure a more secure energy future for everyone. Even addressing something as simple as lighting efficiency can net big results.

Rebates, tax credits and other incentives may be available toward your energy audit in efforts to encourage reduced energy usage and the conservation of natural resources. Contact your local utility company to learn more about the opportunity for a free or reduced price energy audit for your business. The U.S. Small Business Administration (SBA) website also lists programs available to you, including grants and loans to assist your business in making energy efficient upgrades.

To ensure a successful audit, it’s necessary to provide detailed building information, including function, floor plans, orientation, copies of past utility bills, an equipment list, notes on existing issues, updates you’d like to achieve, and more. Talk to a Mr. Electrical® service professional prior to your audit for details. Please click here to see example energy audits from our company.

Promote the sustainability of your bottom line - and the planet - by contacting Mr. Electric to schedule your commercial energy audit today.

By Clarissa Allison | October 16th, 2015

Many of us get excited to decorate for Halloween and Thanksgiving, but why should our homes miss out on the sheer delight and beauty of Fall colors for the rest of the season? If you love pumpkins, the warmth of gold and rust tones and ever-changing leaves, consider decorating with autumn-themed accessories this season. Some Halloween decor like brooms, scarecrows, and orange lights represent fall itself and can be extended beyond October decorations. If you’re looking for an understated alternative to ghostly props and frightful window clings, try dazzling your home and your guests with the following fall lighting ideas this year.

Time to ditch the band posters! Show off a new painting or favorite framed photograph with a battery-operated picture light that installs easily and without messy cords.by Celebrate home ownership by decorating the front door or mailbox  with a customizable house number sign.

Repairs are an inevitable part of home ownership and there’s nothing quite as frustrating as not having the right tools. Cover all of their bases with a 130-piece tool set. Make small repairs and upgrades easy with a flexible work light that can clamp onto surfaces and direct light right where they need it.