I have a 2007 300 and if I get a jump it will start most ...

Q: I have a 2007 300 and if I get a jump it will start most of the time and later will need a jump again to start

asked by on October 01, 2017

My car won't start without a jump then after I turn it off I have to get another jump but sometimes it won't start is it battery starter or alternator
My car has an automatic transmission.

I would start with having the battery load tested to see if the battery needs to be replaced. If the battery is good, I would then 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

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

front driver tire area makes rattling noises when driving over any size bump or whole on the road

Rattling noises in the front suspension could be due to strut faults, loose bushings, a loose sway bar or links, or any other suspension component that is no longer tightly secured to the frame. Another possibility is loose brake parts...

Received a diagnostic code P0562.

The code you have indicates that there is low voltage to the powertrain control module. This is likely due to your battery being low on charge due to age. When the engine first cranks over it is a great strain...

Headlights and turn signals don't work

Your Dakota's headlight and turn signal issues could stem from the multifunction switch on your steering column, which controls the turn signals and high beam input. Another possibility is the Front Area Module, which controls all of your exterior lights;...

Related articles

A Buyer’s Guide to the 2012 Chrysler 300
The The Chrysler 300 is a large luxury sedan that looks great, handles well, and has more power than many realize. Chrysler was once one of the biggest automakers in the world, and with this vehicle, they showed that they...
The Best Used Cars to Buy If You’re a Massage Therapist
If If you're a massage therapist, one of the cornerstones of your business has to be that you don’t keep your clients waiting. That means you need a vehicle that’s reliable. You also will have to move your gear, including...
The Best Used Cars to Buy If You're Over 50
Shopping Shopping for a car when you’re over the age of 50 begins to shift a bit, as your priorities tend to change. Suddenly it’s not so much about what the vehicle looks like, or how much space it has...