How To Wire Fish Finder To Fuse Box?

How To Wire Fish Finder To Fuse Box
There are times when you need to hook up all the accessories directly to the battery, and other times, you will need to hook all your electronics to the fuse box. When it comes to fish finders, it’s better to wire them directly to the fuse box.
Before I show you how to wire fish finder to fuse box, there are a couple of things that I would like to discuss first.
It’s recommended that you have a fuse for every power wire, and the fuse should be close to the power source as possible. Depending on the expected load or the side of the gauge, whichever is less, you should size the fuse.
Otherwise, a frayed or pinched wire can overheat and cause a fire which is something you don’t want to happen. It doesn’t matter whether it’s a fish finder or other electronic; you should never run anything directly to the battery with an inline fuse.
Instead, it’s better to have two separate pairs of wires connected to your main battery and use a fuse block. One pair of wires should be about 8 or 10 gauge, and the other pair of wires should be heavy.
The heavy wires will go straight to the trolling motor, and the other wires should go to a fuse block. The location of the fuse box should be near the accessories. For example, you can place it under the console, in the console, or in a location that is near a tiller seat.
Cut all of the inline fuses. This is because you are using a separate fuse box which is a lot safer, and you don’t need any inline fuses for anything in the boat. Let me rephrase that you won’t be needing any more inline fuses.
Instead, what you should be doing is that you should run all the electronics to their own fused spot on the box. On the fuse box, there will be corresponding fuse spots to run each accessory to its own spots.

What About Circuit Breakers?

Good point. The starting battery that is connected to the fuse block via a wire should have a 30- or 40-amp circuit breaker bolted to it. It’s also a good idea to install a circuit breaker for trolling motor connections and batteries.
This is recommended because it will protect the wires that are connected to the fuse block. Bolt a 50-amp circuit breaker to the starting battery before you connect the heavy wiring for your trolling motor. Once this is done, you can safely wire your fish finder this way.

Wiring A Fish Finder To A Fuse Box

In the following section, I will be showing you how you can easily wire a fish finder to a fuse box. For this, you will need the following items.
For this demonstration, I will be showing you how you can install, wire, and mount a fish finder to your kayak properly using a fish finder unit that comes with its own fuse kit.

Step 1

With your fish finder unit, you will get all the connectors and wires. The connection wire actually comes with a top cut-off for easy wiring. Insert the wires into the butt connectors so that you can insert them into the male heads of the battery.
The connectors will go straight into the battery. You don’t have to take any extra measures to keep the battery waterproof. Keeping the unit inside a dry bag will be enough.

Step 2

Now, you will need some basic wire cutters and some box cutters if you need help cutting wires. Now, take out your heat shrink wrap and the electrical tapes. You will need all of these for this step. I prefer to use shrink wrap for extra security to hold all the connectors tight.

Step 3

Put your heat shrink wrap on the black wire first and then your female end on the wire tip. Make sure to get the correct wire gauge and the butt connector. You would want something that fits snug and fit right away. You don’t want to crimp it down too much.
After that, tighten the connectors using a crimper and reinforce them with some electrical tape so that they will be double secure. Crimp it down a couple of times along the whole shaft just to make sure it’s all nice and snug.

Step 4

Repeat the same for the ground/black wire. Start by reinforcing the wire with some black electrical tape. The reason why you would want to use black tape is that you want to make sure that you can tell which wire red and which wire is ground.

Step 5

Make sure all the connections are nice and snug. Now, try starting the fish finder to see if everything is working. Now you are left with the transducer.

Wiring The Transducer

Unlike the head unit or the display, the transducer only has one wire coming out of it. All you have to do is connect it to the head unit. You don’t need to separately connect it to the fuse box or the battery.
The wire of the transducer is a long one, and you need to route it around the boat and to the main display of the fish finder. You might need to drill a hole if you don’t have any other way to pass the wire.
That being said, you can try positioning the transducer closer to the head unit so that you don’t have to drill any holes.


As you can see, there are two ways you can connect your fish finder. Rather than connecting the main unit directly to the battery, it’s better to connect it to a fuse box first for obvious safety reasons. On that note, we conclude our article on how to wire a fish finder to a fuse box.
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