A relay is an electrical switch that lets a low current circuit control a high current circuit such as a large LED light bar. … If you are using a light pod that does not have a very large amp draw, you may not need a relay switch, but if you are using a larger LED light bar, they are a must have.
What is the purpose of a relay on lights?
Relays can be used to switch a low-current trigger to high current, switch a circuit on or off, reverse polarity, and much more. When adding LED lights, such as off-road light bars, driving/work lights, or other auxiliary lights to a vehicle, you must add a circuit to power the light adequately.
Is it illegal to drive with an LED light bar?
A maximum of four driving lamps (including LED light bars) can be fitted to a vehicle in addition to the vehicle’s main beam headlamps. The lamp/s must be installed in a way that the light produced does not cause the driver of the vehicle discomfort either directly or by reflection.
How many amps does a LED light bar use?
LEDs use about one-fifth the power for the same amount of light output. So for your light bar, it would consume one-fifth of the current, i.e. 0.2 amps from a 120 VAC source, or 2 amps from the car battery.
Do I need a relay?
One of the most common situations that require the use of a relay occurs when an application needs to switch from high to low current (or vice versa) within the same circuit. For example, the temperature sensors that power HVAC units require levels of amperage that vastly exceed the capacity of their wiring.
Why use a relay instead of a switch?
Relays are often used in circuits to reduce the current that flows through the primary control switch. A relatively low amperage switch, timer, or sensor can be used to turn a much higher capacity relay on and off. Another primary use for relays is when upgrading to halogen headlights on an older car.
What size fuse should I use for LED lights?
75mm is good for about 7.5 amps max. I generally like to have at least 100% extra rating so a 3 amp fuse max is what i would use. This should be plenty for 4 leds. If you have working leds but blow a 10A fuse i think your wiring needs checking and you will probably find your fuse is directly across the battery.
Should I put a light bar on my truck?
LED light bars are a cheap, provide good close-range illumination, and are easy to mount on your truck. … If you’re driving in places where you drive slowly and need to see what’s close to you, such as off-roading or driving a mountain or heavily forested road, then a light bar is a good option.
Is it illegal to have a light bar on your bull bar?
The short answer is no. The technical wording is that the light must not be in the drivers line of sight. This means, for most of us, that by placing a light bar on the top of your bull bar it will interfere with your line of sight. For those that have a low set loop or no loop at all you will be ok under this ruling.
Where do you mount LED light bars?
How to Choose an LED Light Bar or Pod Mounting Location
- The Front Bumper. The front bumper is the most common place to mount a light bar, and there are several key advantages to putting your light here. …
- Lower Windshield Pillar Mount. This location is best suited for LED light pods. …
- Above the Windshield. …
- Combination Mounting.
25 янв. 2016 г.
Do LED lights draw less amps?
You’ll find out why LED lights draw less from your battery while providing the same amount – or even more — light than the old incandescent ones. … When Dave connects incandescent bulbs to an amp meter, they draw up to 1.6 amps, but when LED lights are used, they only pull about . 26 amps.
How many amps do 12 volt LED lights draw?
For example, a 120V LED system will pull 1 Amp in a 120 Watt system, while a 12V LED system will need to pull 10 Amps to power the same 120 Watt system.
What gauge wire should I use for LED light bar?
LED Lights are expensive and in all cases should be protected against early burnouts. OPT7 Wiring Harnesses achieve this by using silicon infused 16 American Wire Gauge (AWG) cables that better control against voltage spikes and heat. The last line of defense against is the included relay and fuse.
Can you put a relay in backwards?
Relays can’t be inserted backwards. The ones you can put in two ways, will work either way.
Do you need a relay for a horn?
You can run that horn without a relay, but be prepared to listen to it wail uncontrollably until the wiring catches fire or the battery dies. If you are trying to use the original horn relay it won’t work.
When would you use a 12V relay?
12V DC relay switches are the best solution for full voltage applications, as they allow a low current flow circuit to control a high current flow circuit, like a vehicle’s horn, headlights, auxiliary lamps, fan motors, blower motors and countless pieces of equipment existing on vehicles today.