Best answer: Do you need a relay for LED light bar?

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?

Using a relay keeps the high current portion of the circuit away from the switch and pulls the current directly from the battery to your KC’s. The relay also allows you to tie your lights into a secondary 12-volt circuit such as your high/low beams or ignition.

Do you 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.

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Do you need a fuse for LED lights?

Hi Nick, yes you should fuse LEDS or any other piece of gear attached to the battery. The purpose of the fuse is to protect the wiring not the attachment. As a general rule of thumb the current rating of wire is about 10 times the area.

How many amps does my LED light bar draw?

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 for rock lights?

If you don’t use a relay, the switch and all wiring will need to be able to handle the draw.

Can I wire a light bar without a relay?

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.

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 I need a relay for a horn?

The horn itself may require 24A or more. When the relay is activated, it can transfer the needed amperage to the horn through wiring which is designed to take the load. … In order to run wiring for everything which is controlled there, a relay is the way to go.

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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. How is a relay designed?

How many watts can a 5 amp fuse take?

Fuse ratings

45 AMP For circuits of more than 13kw (13000 w)
13 AMP For appliances between 700 and 3000w (3kw)
5 AMP For lighting circuits. The maximum permissible load of a lighting circuit is 1200w or 12* 100 watt lamps
3 AMP For appliances up to 700 watts, such as table lamps and alarm clocks

No, it’s not illegal to drive with your interior lights on as there’s no legislation mandating whether people can, or cannot, legally drive with interior lighting. However, by illuminating the interior of the car you are making it much harder to see outside.

What FUSE do I need for 12v?

If this is for general purpose power in a car or boat, I would suggest wiring the 12 volt cigarette socket to the battery with a 20 amp fuse in the circuit. If you use a 10 amp fuse, it may not be a high enough rating for accessories such as air compressors and power inverters.

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.

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What size fuse do I need for LED light bar?

A 10 amp fuse will protect the circuit. The 16 gauge wire will handle 10 amps in the length of wire that you will be using. The switch is rated for 20 amps. So, the 10 amp fuse will protect the circuit from overload.

How many amps does a 72 watt LED light bar draw?

(A=W/V). So if you know the watts of the lights, you can easily calculate amps. For example, a 55W light would draw 4.58 (55/12) amps.

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