Expert Guide To Fixing Harley Running Lights Not Working

The harley’s running lights not working could be due to several reasons. It could be a blown fuse, a faulty switch, or a bulb problem. Check the fuse box and replace blown fuses, inspect the wiring and the switch for signs of damage or wear, and replace the bulbs if necessary. Proper diagnosis by a trained mechanic may also be the solution. Harley motorcycles are known for their iconic style and power on the road. However, like any other vehicle, they can encounter problems too. One common issue that some harley owners may face is the running lights not working.

The running lights are important for visibility and safety while riding. Without them, it can be difficult for other motorists to see and avoid you on the road. In this article, we will discuss some possible causes and solutions for harley running lights not working. By following the steps and tips provided, you can ensure that your harley’s running lights are functioning correctly, and you can ride safely on the road.

Diagnosing The Problem

Harley davidson bikes are known for their robust engines and their iconic design. However, like all machines, they may encounter issues from time to time, such as running light failure. This particular problem can result from several underlying issues and requires prompt attention.

In this blog post, we’ll look at some common causes of harley running lights not working and how you can diagnose the problem using the following steps.

Checking The Fuse Box And Possible Faults

The harley running light circuit relies on a fuse to protect it from power surges or short circuits. Overloading may cause the circuit to blow the fuse, resulting in running light failure. Therefore, in case your harley running lights stop working, the first step should be checking the fuse box.

  • Locate the fuse box on your bike
  • Remove the fuse box cover
  • Check the fuse for any signs of damage. If the wires inside the fuse appear burned or broken, it’s an indication that the fuse is blown.

Replacing Burnt-Out Bulbs

If the fuse is not the problem, you should check the running light bulbs. Although it’s rare for all the bulbs to stop working simultaneously, it’s always good to check them to eliminate that possibility.

  • Locate the running light bulbs on your harley.
  • Take out the bulbs from the light housing.
  • Inspect the bulbs for any signs of burnout. If the filament inside the bulb appears broken or black, it’s a sign that the bulb is burned out.

Inspecting The Wiring And Connections

Sometimes loose, corroded, or damaged wires and connections can cause harley running light failure. Thus, it’s essential to inspect all the wires and connections carefully.

  • Check all the wiring connections for looseness, corrosion, or damage.
  • Confirm that all the wires are connected in the correct polarity. Use the manual or diagram to determine the correct wire connections.

Checking The Battery And Charging System

If none of the above solutions work, you should examine the battery and charging system. Sometimes running light failure might result from a discharged or faulty battery.

  • Check the battery charge level using a multimeter. The voltage should read above 12 v.
  • Charge the battery or replace it if it’s faulty.
  • Check the charging system by testing the output voltage using a multimeter.

Using A Multimeter To Check For Faulty Circuits

If troubleshooting the issue manually is fruitless, you may use a multimeter to diagnose electrical issues.

  • Turn on the bike and connect the multimeter probes to the running light switch wires.
  • Check the multimeter output. If the output voltage is low or zero, it’s an indication of an electrical issue.
  • Continue testing the circuit or seek the assistance of a technician if you feel unsure.

If your harley running lights stop working, it’s essential to diagnose the problem to fix it promptly. The tips above should help you troubleshoot the problem and determine the possible solutions. Always follow safety guidelines and wear protective gear like gloves and safety glasses when handling electrical parts.

Common Causes Of Harley Running Lights Not Working

If you own a harley davidson, you know that the running lights are a great safety feature that must work correctly. The running lights make it easier for other road users to spot you, especially when it’s getting dark. However, if your harley running lights are not working, you could be at grave risk of an accident.

In this section, we will take a look at the common causes of harley running lights not working and what you should do to fix them.

Dimming Or Flickering Running Lights

If your harley running lights are flickering or dimming, it could be a sign of an electrical problem that is preventing the lights from receiving enough power.

  • A damaged regulator or rectifier. These components are responsible for charging the battery and ensuring the lights receive a consistent power supply.
  • A weak battery. If the battery is failing, it won’t provide enough power to the lights, especially when the motorcycle is idling or running at a slow speed.
  • Loose connections or corroded terminals. Over time, the wiring connections can become loose or corroded, leading to poor electrical conductivity.

Inconsistent Running Lights Functioning

If your harley running lights are only working intermittently, it could be due to any of these issues:

  • A faulty switch. If the switch is damaged, the lights won’t turn on consistently.
  • A damaged relay. The relay is responsible for sending the signal to turn on the lights, and if it’s damaged, the lights won’t work or will work intermittently.
  • A damaged or broken wiring connection. Any damage or breakage to the wiring can cause inconsistency in the lights’ function.

Lack Of Output For Running Lights

If you turn on your harley’s running lights, but they don’t produce any light output, then the following could be the reasons:

  • A damaged or broken bulb. If the bulb is damaged or burnt out, the lights won’t work.
  • A damaged or broken fuse. If the fuse is blown, the lights won’t receive any power supply.
  • A damaged wiring connection. Any damage or break in the wiring could cause the lights to fail completely.

Repeatedly Blowing Fuse

If you notice that the fuse for your harley running lights keeps blowing out, this could be a sign of a severe electrical issue.

  • Overloading of the circuit. If you have added aftermarket lighting or accessories that draw too much power, it could overload the circuit and blow fuses.
  • A short circuit. If there is a short circuit in the wiring, it will cause the battery to draw too much power, causing the fuse to blow.
  • A damaged regulator or rectifier. These components regulate the power supply to the battery and can cause issues that lead to fuse blowouts.

Malfunctioning Charging System

If your harley’s charging system is malfunctioning, it could cause the following issues with your running lights:

  • Dimming or flickering lights due to decreased voltage from a failing charging system.
  • Inconsistent lights functioning due to a weakening battery.
  • Lack of output due to the battery not being charged.

Possible Damages To The Wiring Or Connections

Finally, damages to the wiring and connections of your harley running lights could cause a range of issues, including:

  • Dimming or flickering lights due to poor electrical conductivity.
  • Inconsistent lights functioning due to damaged or broken wiring connections.
  • Lack of output due to damaged or short-circuited wiring or connections.

If your harley running lights are not working correctly, you could be at risk of an accident. It is crucial to identify and fix the underlying issues as soon as possible. From a damaged regulator to wiring connections, the causes of harley running light issues are various.

Regular inspections and maintenance can help prevent issues from occurring and ensure that your harley’s running lights are always functioning correctly.

Steps To Fix Harley Running Lights Not Working

Harley-davidson bikes are a symbol of strength, power, and prestige. It’s not just a motorcycle, but an emotion that every rider holds close to their heart. However, encountering issues with these bikes can be quite frustrating, especially when it comes to the running lights.

In this blog post, we will discuss some of the common faults that cause harley running lights not working and outline the steps to fix them.

First, Identify The Issue And The Possible Causes

The first step in fixing your harley running lights is to identify the issue and the possible causes.

  • Blown fuse
  • Corroded or loose connections
  • Malfunctioning switch
  • Burnt-out bulb or led

Check And Test The Various Components Of The Running Light System

Once you have identified the possible causes, the next step is to check and test the various components of the running light system.

  • Check the fuse and replace it if necessary
  • Inspect the connections and ensure they are not corroded or loose
  • Test the switch to determine if it’s malfunctioning
  • Inspect the bulbs or leds and replace any that are burnt-out

Repair Or Replace The Malfunctioning Parts Based On The Extent Of The Damages

After testing the above components, you will be able to determine which parts are malfunctioning and to what extent. If the problem is minor, you might only need to repair the parts. However, if the damage is more severe, replacing the components could be the only option.

Test The System After Making Necessary Repairs

After repairing or replacing the necessary parts, test the system to ensure that it’s working correctly.

  • Verify that all lights are working as intended
  • Check that the dimmer switch is functioning correctly
  • Ensure that the lights are properly aligned and adjusted
  • Test the lights at different speeds and during both daytime and nighttime conditions

Ensure All Other Electrical Connections And Wires Are Tight And Well-Secured

If your harley running lights not working problem still exists, double-check all other electrical connections and wires, to ensure they are tight and well-secured. Loose wires and connections could cause the running lights not to function correctly.

Before taking any significant action, you must first identify the problem and its cause. This approach can save you time and money by allowing you to focus on the correct components. Remember to follow the above steps carefully, and your harley running lights will be back to normal in no time.

Preventative Measures

Harley Running Lights Not Working: Preventative Measures

Riding a harley-davidson bike is an exhilarating feeling, but it is crucial to ensure your bike is in good working condition. One of the most critical aspects of maintaining a safe riding experience is to ensure all the lights are functioning correctly.

Dim or burnt lights are a huge safety hazard, and it is advisable to address any issues without delay.

Importance Of Timely Maintenance And Servicing

Preventative maintenance is the key to safe driving. A routine check-up can help to identify any problems before they become a significant issue. Regular servicing will ensure your harley-davidson is operating correctly, save money on costly repairs, and prevent accidents.

A harley is a large investment, and if maintained, it will provide years of enjoyment.

Tips To Check The Battery, Fuse And Bulbs To Ensure They Haven’T Been Damaged

Checking your harley’s battery, fuse and bulbs should be a part of your preventative maintenance routine.

  • Battery: check for loose connections and clean any corrosion around the battery terminals. If the battery is over two years old, consider replacing it with a new one.
  • Fuse: inspect the fuse for any visible damage or burnt-out spots. Replace any damaged fuses immediately.
  • Bulbs: check your headlight, taillight, indicators and brake lights for any damages or burnt-out bulbs. Replace them right away.

Significance Of Staying Alert To Minor Signs Of Damage Or Faults

Staying alert to any minor signs of damage or faults is essential to avoid costly repairs and accidents on the road. Regularly check your running lights, and if you notice any defects, get them fixed immediately. Delaying repairs can lead to more severe problems and potentially endanger your life on the road.

Keeping your harley operating at its best is crucial to enjoying a safe and problem-free riding experience. Remember to conduct regular maintenance and servicing, perform quick checks on your battery, fuses and bulbs, and stay alert to any minor signs of damage or faults.

Safe riding!

Frequently Asked Questions On Harley Running Lights Not Working

Why Aren’T My Harley Running Lights Turning On?

There could be several reasons, such as a blown fuse, a defective relay, or a faulty wiring connection.

How Can I Check If My Running Lights Are Receiving Power?

You can use a multimeter to check for voltage at the running light connector. If it displays zero volts, there is no power.

Can I Fix The Running Lights Myself?

If the issue is with a blown fuse or loose wiring, you may be able to fix it yourself, but be cautious. For other issues, consult a professional mechanic.


To sum up, harley running lights not working can be a frustrating experience for any biker, but there are several troubleshooting steps you can take to fix the issue. Whether it is a problem with the bulb, wiring, switch, or relay, it is important to diagnose the root cause and resolve it before venturing out on the road.

With the right tools, skills, and knowledge, you can do the repairs yourself or seek help from a professional mechanic if needed. Regular maintenance and inspection of your bike’s electrical system can prevent such issues and ensure a safe and enjoyable riding experience.

Remember to always prioritize safety and follow the manufacturer’s guidelines to maintain the quality and longevity of your beloved harley. So, keep these tips in mind and hit the road with confidence while enjoying the vibrant and stunning glow of your harley’s running lights.

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