Why Does My Light Bar Stay On?

It's likely that drivers have done some research on light bars for vehicles, and you already know that they are the most efficient and powerful type of illumination an automobile can have installed.

If you own a vehicle, you may be willing to add a light bar for better visibility. The issue is that all automobile isn't a truck, and as a result, drivers are not sure whether or not external LED light bulbs can be placed on it.

Not to panic - even if typical light bars aren't a good fit for most vehicles, you can purchase a light car that contains customized pods and spotlights that will be a great fit for any coupe, sedan, convertible, or hatchback. Increased road visibility will give a higher level of security from highway risks and disasters, allowing light bars to be used more effectively.

What Is the Rate at which a Light Bar Will Drain a Battery?

Accurately estimating the amount of time, it will take for the battery to be totally drained may possibly prevent the light bar from completely draining the power. By using the following formula, you may determine how quickly the light bar will deplete the battery's capacity:

If you had a 70Ah battery that was completely charged, you might estimate the draining time as follows:


Although, it is always preferable to use the battery for a fraction of the time that you have predicted; it is always preferable to spend less time. Also, it's crucial to remember that the current battery capacity may decrease after a few months, thus the Ah quantity stated won't be the complete amount of capacity.

A battery that's also nearly completely drained will not be able to give the very same high voltage as a fully charged battery, and drivers will have difficulty starting the engine, which should be particularly noticeable when it is cold outside.

Why Does the Light Bar Stay On?

The light bar will turn on and begin to glow immediately after the battery has been replaced and the positive wires have been connected. The most common things to observe are that the light switch will be in the off position and that the switch light (a little red indication) will be turned off, as is normal.

If, after turning on the switch, the indicator illuminates as it should have, or if you have attempted removing all three wires from the switch but the light bar remains illuminated, drivers must follow the methods outlined below.

Occasionally, everything functioned perfectly before the batteries were switched. When you turn on the light bar, it begins to glow, and when you turn off the switch, it stops illuminating.

1) The relay be sticking to each other. It could be that the two end-contacts inside the relay have welded themselves together and that's why the light stays on. The secondary and primary sides of the relay have been welded together inside the relay. So, you need a new relay and replace it per cliff.

2) It's possible that anything is faulty with the wiring. If you disconnect the three leads from the LED, there will be no power to the LED, and the light bar will not stay on. The switch has three connections: a positive +, a negative -, and a connection to the load = Light bar line. Try connecting cables where they should be is a good idea because the reason might be that the wires are hot-wired.

3) Cliff the load side of the switch should have powered the relay that is why the relay got stuck and the light bar stays on.

4) Don't unplug the switch if the relay is still sending power to the LED Bar instead of switches the light will stay on.

5) Disconnect the red/black wires from the battery, and then reconnect them once again. From the battery, energy is sent to the relay, which in turn delivers power to the light bar.

6) The relay is simply turned on and off by the switch. With this method, you may have a modest load connected to a little switch on the dashboard with just a few wires. The large cables and heavy load are sent directly to the lamp (through the relay).

7) The relay is equipped with an electromagnetic coil that is spring-loaded. With each switch pressed, an electromagnet engages, supplying electricity to the light; with each switch depress, the magnetic disengages, and a spring forces the switch open.

If the light bar continues to illuminate, it seems that the relay has been jammed closed. You may also try tapping on it to see if it opens up. It's possible that it was shorted and welded shut while you were experiencing the battery issues.

The electromagnet in the relay should click when the switch is turned on and off, and you should be able to disconnect the relay and put in a new one after that.

Frequently Asked Questions

Can a light bar drain your battery?

Light bars can drain your batteries, but not very fast. The amount of energy it takes to power a light bar is quite low, and hence, it won't drain your battery unless you leave it on for a long time. This is especially true if you're using LED lights instead of the traditional incandescent bulbs.

Does my light bar need a relay?

A light bar requires a low-voltage DC connection for the lights to work. It also needs a relay to turn the light on and off. This is to ensure that the lights turn on when you switch on the main power supply, and switch off when you switch off the main power supply.

Do you need a fuse for a light bar?

The short answer is yes, you do need a fuse for a light bar. It’s a safety precaution to prevent the circuit from becoming overloaded. The best way to do this is to use a fuse holder and fuse.

How do I silence my light bar?

There are a couple of ways to silence your light bar. For example, you can remove the batteries completely or add a solar cell to charge them. But this doesn’t mean that the batteries are dead. To remove the batteries from a light bar, you should first remove the screws around the battery compartment. After this, pull the cover off. Then, you can simply remove the batteries from the compartment and dispose of them. 

Alternatively, you can install a solar panel to charge the batteries. You will need to find a 12V to 24V converter that will convert a regular 12V source to a 24V source, or else, you will end up with a bunch of loose wires in your garage.

Can you wire LED light bar directly to battery?

Yes, you can wire a LED light bar directly to a battery. In fact, there are several battery-powered LED light bars available online and in stores. But if you don’t know how to install one, you should contact a professional electrician first to ensure that the installation is safe and secure.

How long will a 12v battery run LED lights?

LED lights tend to draw less power than incandescent bulbs, and hence can operate on a 12V battery for much longer. A 12V battery can typically run LED lights for several years, while an incandescent bulb can only last a few months. If you need to charge your battery frequently, you should use a solar panel to charge it.

Final Note

For more information on why the light bar remains on or why your lights are flickering, please read our guide thoroughly. When you choose to get a light bar, you should state clearly what you want to use it for.

Light bars and its components have a lifetime that is 20 times greater than that of halogen bulbs. Additionally, light bars for automobiles do not waste a great deal of energy, which is advantageous.

Furthermore, while selecting a light bar, it is important to research the regulations of the county or state since the laws differ from one another.

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