Answer
Just because a Battery is new doesn't mean that it's fully charged and some starters are known to fail, the way you can find this out if either has failed is to get a volt and or amp meter and check if power is going from the Battery to the Starter and in the case of the Battery check how many volts are available. If there are only ten volts, that could be the cause of your car not starting.
When opened by the starter switch, it sends electricity from the battery to the starter motor to start the car.
Flat battery or sticky starter motor / solenoid - try re-charging battery or get a jump start Flat battery or sticky starter motor / solenoid - try re-charging battery or get a jump start
dead battery bad starter solenoid bad starter loose or corroded battery or starter cables
Its either the battery or starter motor. Have you tried to jump start it?
Battery or Starter motor.
No. The relay is what actuates the starter motor, whenn you turn the key to the start position.
battery may not be the problem check your starter motor and ignition switch
Your battery is low. You probably has to replace the battery. Or maybe the starter motor solonoid is faulty
Try starting the car. If it doesn't start, then you might have a low charge in your battery! Turn the headlights on and then try to start the car - if the lights dim and you can hear the starter motor solenoid "click" or the starter turns the engine slowly then your battery is more than likely at fault. -if the lights don't dim and you can't hear anything from the starter motor then it is likely to be a loose earth connection or a loose connection to the starter motor solenoid (the thin cable out of the two that connect to your starter motor) Simples.
if you have good battery and cable connections, the starter motor or starter relay is bad
Follow the red battery cable which will eventually lead you to the starter.
Cold climate starters are capable of delivering higher current during cold start. Cold start system is always a combination of the starter motor with a suitable battery.