Humminbird power cables come in different lengths to suit different needs. The most common lengths of Humminbird power cables are 8 feet, 20 feet, and 40 feet. Choosing the right length depends on the type of boat and where you plan to mount the fish finder unit.
Typical Humminbird Power Cable Lengths
Here is an overview of the most common Humminbird power cable lengths:
| Cable Length | Description |
|---|---|
| 8 feet | Best for small boats like bass boats, inflatables, and kayaks where the fish finder unit is mounted close to the battery |
| 20 feet | Versatile length that works for most average sized boats from 16 to 21 feet |
| 40 feet | Needed for large boats where the battery is located far away from the mounting location |
The 8 foot cable is a good choice for small boats like bass boats, inflatables, or kayaks where you plan to install the fish finder unit right next to the battery. It eliminates excess cable slack.
For mid-sized and larger boats, the 20 foot cable allows more flexibility in running the cable to the battery which may be located under seats or in storage compartments. It works well for most average sized fishing boats in the 16 to 21 foot range.
On big offshore fishing boats and cruisers, the battery is often located in an enclosed compartment that is far away from where you want to mount the fish finder unit. In these cases, a 40 foot power cable is needed to reach the battery.
Extension Cables for Longer Runs
If the standard cable lengths are not long enough for your application, you can add extension cables to increase the reach. Humminbird sells 15 foot and 30 foot extension cables that can be daisy chained together.
For example, if you needed a 50 foot power cable run, you could connect a 20 foot standard cable and 30 foot extension cable. For a 65 foot run, use a 20 foot standard cable with a 30 foot and 15 foot extension.
One thing to keep in mind with long cable runs is voltage drop. The longer the cable, the more voltage you will lose over the length of the cable. This may result in reduced performance on the sonar readings.
Tips for Routing Your Cable
Here are some tips for cleanly routing your Humminbird power cable:
- Use cable clamps to securely attach the cable every 18-24 inches along the route
- Avoid routing near sharp edges or areas where the cable may get pinched
- Use grommets when passing through bulkheads or panels
- Leave some slack at both ends for movement and vibration
- Use cable sleeves or conduit for extra protection if running externally
- Keep cable away from electronics or other sources of interference
Taking the time to securely run the cable and avoid damage will ensure reliable operation of your fish finder. The last thing you want is a loose cable shorting out due to vibration or being cut by a hatch slamming on it.
Power Cable Connectors
Humminbird power cables use a combination of connectors to interface with the battery and fish finder unit:
- The battery end uses ring terminals that attach directly to the battery posts.
- The fish finder end uses a modular plug that locks into the unit.
- Extension cables also use modular connectors.
The modular connectors have a twist lock to provide a secure, waterproof connection. Make sure to fully twist the lock in the direction of the arrow indicators until it clicks into place.
Replacing a Damaged Power Cable
If your existing Humminbird power cable becomes damaged, you can readily purchase replacement cables on the Humminbird website or Amazon. Just make sure to get the right length for your application.
Replacement cables cost around $30-50 depending on the length. Installation involves removing the old cable, fitting the new cable through the existing route, securing with clamps, and reconnecting the terminals or connectors.
Be sure to disconnect the battery before replacing the cable to avoid shorts. Also confirm the new cable is the same gauge as the old one, usually in the 18 to 20 gauge size range for most trolling motor and boat mount sonar units.
Using the Proper Power Cable
It’s important to use the official Humminbird power cable supplied for that specific model fish finder. Don’t try to substitute a generic or aftermarket cable. The cables are engineered to deliver the correct voltage for each model unit.
For the best performance, always use thecable length and gauge recommended. Also be sure to follow proper routing practices and make secure connections. Taking the time to do it right will result in noise-free sonar signals.
Conclusion
In summary, Humminbird power cables are available in different lengths like 8, 20, and 40 feet to accommodate various boat setups. Extension cables can provide even longer runs if needed. For optimal results, use the proper gauge cable for your model and follow good wiring practices.
With the right power cable installation, your Humminbird fish finder will deliver years of trouble-free performance. Let the power cable length guide help you choose the best cable and install it neatly and securely.
