If you've recently hauled your Harley Davidson on a trailer and found the battery dead upon arrival, you're not alone. This common issue can leave you stranded and frustrated, but understanding the causes and possible solutions can help prevent it from happening again. Let's explore why Harley batteries might die after being on a trailer and how to address it.
Firstly, it's essential to understand that trailering a motorcycle can put a significant strain on the battery. The constant vibrations, heat, and potential electrical draw can all contribute to an already stressed battery becoming completely depleted.
Understanding Harley Battery Drain on a Trailer
Harley batteries are designed to provide a powerful spark for ignition, but they're not typically equipped to handle prolonged electrical draws. When a motorcycle is on a trailer, certain factors can cause an increased draw, leading to a dead battery.
One common culprit is the security system. If your Harley's security system is active while it's on the trailer, it's continuously drawing power, even when the bike is off. Other factors such as a malfunctioning alarm, a faulty wiring harness, or even a bad battery itself can also lead to excessive drain.
Security Systems and Battery Drain
Harley Davidson's security systems are advanced, offering features like remote start and anti-theft protection. However, if not properly deactivated before trailering, these systems can drain the battery rapidly. Always ensure your security system is turned off when hauling your motorcycle to avoid a dead battery on arrival.
To deactivate the security system, use the ignition switch to turn the motorcycle to the 'ON' position, then use the key to turn the ignition to the 'LOCK' position and hold it for a few seconds. This should disengage the security system and prevent it from draining the battery.
Faulty Wiring as a Cause of Battery Drain
Another reason your Harley battery might be dying on the trailer could be a problem with the wiring harness. Worn, damaged, or exposed wires can cause a short circuit, leading to excessive battery drain. Inspect your bike's wiring before and after trailering to ensure it's in good condition.
If you suspect a wiring issue, consider taking your Harley to a professional mechanic. They can diagnose and resolve any electrical problems that may be causing your battery to drain excessively.
Preventative Measures and Troubleshooting Steps
Now that you understand some of the factors contributing to Harley battery drain on trailers, let's discuss some preventative measures and troubleshooting steps to keep your battery healthy and functioning.
Regular maintenance and proper preconditioning before trailering can significantly extend your battery's life. Here are some steps you can take to protect your Harley's battery:
Proper Preconditioning Before Trailering
Before hauling your motorcycle, take it for a ride to charge the battery and get it up to operating temperature. This helps ensure the battery starts charging immediately when you begin to ride again and prevents excessive drain during transit. Additionally, always store your Harley with the battery fully charged.
You can also consider using a battery tender or maintainer while the motorcycle is on the trailer. These devices monitor the battery's charge level and provide a constant, trickle charge to keep it fully charged and healthy.
Inspecting the Battery and Electrical System After Trailering
After arriving at your destination, always inspect the battery and electrical system before riding. Check the battery's voltage with a multimeter to ensure it's fully charged. If it's lower than 12.6 volts, you may need to charge it before riding.
Additionally, inspect the wiring harness for any signs of damage or wear, and check the security system to ensure it's deactivated. Regularly cleaning and lubing the connectors can also help prevent corrosion and ensure proper electrical connectivity.
In conclusion, it's essential to be mindful of the unique challenges trailering a motorcycle presents for its battery. By understanding the potential causes of battery drain and taking preventative measures to protect your Harley's battery, you can help ensure a dead battery doesn't leave you stranded again. Always remember to properly precondition your motorcycle before trailering and thoroughly inspect the battery and electrical system upon arrival. Safe travels!