If her Ford Ranger’s battery light is on, it way a few things. The is trying come warn you the there is an problem with the charging system. The charging system itself is reasonably simple. It’s virtually always going to be brought about by a negative battery or alternator.

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The battery light come on when it detects the the voltage in the battery is too low. Many battery lights will certainly come on when the car starts if the computer system has detected the the voltage was as well low for a quality start. Through an enlarge battery, you will often an alert this top top the first truly cold job of the year.

You may have actually noticed your Ranger struggling come start, and then the battery light remains on ~ the start. That would suggest a bad battery, but it’s tho worth her while to have actually it tested first.


Ford Ranger Battery irradiate Causes

The charging mechanism in vehicles hasn’t changed that lot in the last 50 years. The engine transforms the alternator, which charges the battery. There isn’t a lot come it, which renders diagnosing it reasonably simple.

1. Battery

The battery is generally there to start your Ranger. It deserve to run off the alternator simply fine once it’s started. This is an important thing come know. A poor battery usually provides itself well-known when you space trying to start the vehicle.

2. Alternator

A usual alternator

A negative alternator will typically make itself known when the engine is already running. If you check out your Ranger’s battery light transforms on if the engine is already running, that is a strong indication the the alternator is no much longer providing enough wattage to power the various electric systems and also charge the battery in ~ the very same time. A brand-new alternator will rectify the problem.

See Also: Ford Ranger negative Alternator Diagnosis

3. Alternator Belt

Nearly all contemporary vehicles usage a serpentine belt to turn the alternator. The serpentine belt turns more than one engine accessory (A/C compressor, strength steering, etc). If the serpentine belt go bad, it will no longer have the ability to turn her Ranger’s alternator sufficient for it to gain an adequate charge.

4. Battery short article Corrosion

The voltage native the alternator is sent to the battery v a wire the connects to the battery post. If the battery post is really corroded, that won’t be able to do its job of sending out the voltage to and from the battery efficiently, and also your Ranger’s battery light will revolve on.

It only takes a second to examine it out. A battery short article cleaner or cable brush can clean it up in no time. Simply be mindful not to get any of the corrosion in your eye.

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Battery light Diagnosis: Ford Ranger

You have the right to diagnose whether her Ranger’s alternator is negative pretty fast at home. If you have a voltage meter, that’s a fantastic place to start.

Voltage Test

The first thing the you’ll want to execute is acquire a great multimeter. V a multimeter you carry out a rapid test to view if your Ranger’s alternator is working or not.

The complying with was take away from poor alternator diagnosis page on this site:

collection the multimeter to check out voltage. Special, you’ll need to set it come 20V DC. Through your Ranger turned off, you’ll connect the negative side of the meter to the negative battery short article or wire. Touch the confident side the the voltmeter come the confident battery wire. Through the engine off, you should gain a analysis somewhere in between 12.0 volts and 12.6 volts. Now that you have a baseline, the time to rotate the engine on. Leaving the wait conditioner off, and the headlights and also any other accessories. After firing the engine up, girlfriend should acquire over 14.2 volts. If you gained 14.2 or more volts, the alternator is charging fine. If the still showing in the 12’s, it’s time to change the alternator. If it’s producing a voltage level in the 13’s, go ahead and also take it right into a parts store and have it tested. It’s more than likely bad. Now, assuming that the alternator was creating over 14 volts, walk ahead and also turn ~ above the headlights, wait conditioner, radio, and any various other accessory you deserve to think of, and also run the exact same test everywhere again. If the voltage dropped earlier into the 12’s, that a very strong indication the your Ranger’s alternator is bad. It’s quiet worth having actually it tested, yet be all set to change it.

Battery Test

If the alternator seemed to it is in charging the battery fine, then it is time to relocate on to the battery itself. Us recommend acquisition it to the regional parts store. Almost every one of them will test it for free. If it’s bad, they’ll also install the new one.

Conclusion: Ford Ranger Battery Light

Your Ranger will operate for a short period of time turn off of the battery alone. But, if the alternator has gone bad, it will ultimately leave girlfriend stranded. If your battery light comes on when you room on the road, acquire somewhere to have actually it experiment as quickly as you can. If you feeling there is something you have the right to add, please leaving a comment below. An excellent luck!