Q: Hi! I have a 2016 Ford Focus. I had just replaced the battery in it, and I am really puzzled with it's starting performance now

asked by on

Hi!

I had just replaced the battery in my 2016 Ford Focus. The old battery was dying, but would start immediately until it could not start anymore without a jump. Ever since replacing the old battery with the new battery two days ago, I have had a sluggish start with it almost all the time.

The old battery had habitual corrosion buildup on it's positive post. The auto tech who installed the new battery, he cleaned out the battery compartment. He cleaned the positive terminal and what he could see of any corrosion on the positive cable near the positive terminal with neutralizing spray. So, now that all this has been done for this new battery, the car now has this sluggish start.

What could be happening? Thank you so much for your time and attention to my concerns! :-)

My car has 37391 miles.
My car has an automatic transmission.

Since you have effectively eliminated the battery as a potential issue, I would suggest having the alternator checked to determine if it is receiving the proper amount of voltage from something called the voltage regulator. The voltage regulator regulates the charging voltage that the alternator produces, keeping it between 13.5 and 14.5 volts to protect the electrical components throughout the vehicle. The voltage regulator controls the field current applied to the spinning rotor inside the alternator. When there is no current applied to the field, there is no voltage produced from the alternator. When voltage drops below 13.5 volts, the regulator will apply current to the field and the alternator will start charging. When the voltage exceeds 14.5 volts, the regulator will stop supplying voltage to the field and the alternator will stop charging. This is how voltage output from the alternator is regulated. When the voltage regulator is not working properly, this may cause the alternator to allow the power the alternator supplies to drop resulting in the battery dying again. I would suggest having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Hi! I have a 2016 Ford Focus. I had just replaced the battery in it, and I am really puzzled with it's starting performance now

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My Ford Focus CZX3 2006 doesn't want to run when I press the gas pedal

Hi there: This type of situation can occur due to multiple mechanical or electrical problems either within the transmission or it can be a braking system failure. If the vehicle will not move at all, even in neutral, then the...

Q: Misfire bank one 4x4 light will not go off

Is there a severe lack of power along with the misfires? A clogged catalytic converter can cause misfires and cause the check engine light to flash. These trucks are sensitive to the type of air filter used and using the...

Q: WHAT KIND OF MOTOR OIL DO I USE AND HOW MANY QUARTS ?

The V6-3.0L Turbo is diesel powered. If that is the vehicle that you have, the oil capacity is 6.8 quarts assuming you install a new filter and, of course, you should use a new filter. In all events, check the...

Related articles

P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.