Ford F-150: Trailer Battery Not Charging – 4 Reasons & Solution

People who want to travel for an extended period may need a giant truck! Having one is a blast, and it offers a good quality ride.

However, while it offers an incredible ride, some issues come with it. Keep in mind that this is not common only for Ford F-150!

In this article, find out about a common problem – a trailer battery that is not charging in your Ford F-150 and find out if there is something you can do about it!

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Is My Trailer Battery Charging On Ford F-150?

Ford F-150: Trailer Battery Not Charging - Reasons & Solution

To know if your trailer battery is charging, you may check the battery voltage with a voltmeter to see if your trailer battery is charging.

The voltage should be between 12.6 and 13.8 volts when the battery is charging. The battery is not charging if the voltage is below 12.6, though.

Why Is My Truck F-150 Not Charging My Trailer Battery?

There are three most common reasons your Ford F-150 trailer battery is not charging.

Let’s take a look!

#1: Connections in Brake Controllers

The most frequent cause of this problem is a brake controller that is improperly attached to the car.

This is so that the trailer batteries can only be charged when connected to the Ford F150’s braking controller.

Only the little 7-pin connection carrying the entire load has to have a wire checked.

You should have no trouble locating this, at which point you may tighten the connections to it.

On the other hand, you will need to repair the connection if you discover that your cable is broken.

#2: Corroded Batteries

If your batteries and brake controller are connected, but the problem persists – the batteries that are rusted may be the source of your issue.

Testing the battery on your trailer will quickly prove this.

Ensure that all of the terminals are securely attached.

Take the batteries off as soon as you can if you discover that they are rusted. So, the link between the batteries and your car is severed by corrosion on the terminals, which is why the batteries can’t keep the charge.

If the battery is stuck, using warm water to soften the sulfate layer should assist. After that, you may scrape it away with a toothbrush or towel!

#3: Battery Or Brake Controller Issues

Finally, if the problem persists, there may be a problem with either the brake controller or your batteries, however, not in the same way as we described above. In this case, you can only do so much.

You can test them by removing the batteries and replacing them with fresh ones. The brake controller, however, is a Ford device that is explicitly fitted.

You will thus have no choice but to get in touch with their customer service department and notify them in great detail about your problem.

Then, they need to be able to provide you with a workable answer.

Alternatively, you’ll need to take your car to their dealer. You should receive a free new brake controller if your Ford F-150 was still covered under warranty.

How Can I Fix The Issue With Trailer Battery No Charging In F-150? 

We told you what to do if you encounter the three most common problems!

However, if you still cannot fit the problems described above with your own, here is what you can do to troubleshoot!

Switch Out The Converter Cooling Fan

The cooling fan for the converter aids in preventing overheating. However, if the fan malfunctions, the converter may overheat and stop charging the battery.

Check to see whether your problem is resolved by replacing the fan.

Change The Converter’s Thermal Sensor

The thermal converter sensor may be the cause if changing the cooling fan doesn’t fix the problem.

You’ll need to swap out the thermal converter sensor to resolve the charging problem.

Look For Failure In The Diode Readings

The converter’s diode transforms AC electricity into DC power. As a result, the battery won’t charge if it malfunctions.

Check the measurements to see whether they are the same in both directions to determine if the diode has failed. If so, then it is the root of the issue.

Examine For A Blown Fuse(s)

The battery may not charge if there is a blown fuse in the converter because it will prohibit the electrical current from flowing correctly.

You should replace it if you see that this is the problem.

That’s it! Hopefully, you resolved your problem! If not, our suggestion is to take it to the mechanic to check where the problem is and to fix it for you.

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