Could be several things but you need to check the terminals on the battery for good connection, the cables coming off your battery for signs of corrosion, and if all those check out and you know you are getting plenty of power to your starter solenoid then you have a bad starter solenoid. Basically inside your starter is a contact plate that tends to get corroded, if it gets to bad then it will not give your starter enough power to actually turn your engine over. However, it will give enough power to try and activate your starter hence the clicking sound. Sometimes you can hit your starter with a hammer to try and shake some of the rust or buildup inside your starter free and it might let you start your car.
Does the engine turn over and then make the clicking noise while trying to start, or does it not do anything but make the clicking noise when you turn the key. If its not turning over at all then it might be a battery problem, Try cleaning the battery terminals, and/or charge the battery, Could also be the starter solenoid, but start with the battery first.
Charge or replace the battery.
if you have connected it up properly it could be just that your battery is completely flat and that when you hook up the charger some relays are getting power and making the clicking noise
It could be solenoid, starter, battery, alternator not CHARGING the battery or corroded battery terminals.
1. The battery could be dead. 2. The starter could be stuffed. 3. The alternator Could be stuffed. Put another battery in see what happens.
If your vehicle is making this noise, it is most likely a faulty starter. You should first make sure you battery is not dead before getting it serviced.
Probably it's a low battery, though it could be a bad starter. You are probably hearing the starter solenoid clicking.
A loud fast clicking noise is usually indicative of a low battery or a loose cable.
When the battery does not have enough voltage to turn the starter over it will sometimes make a clicking noise.
If just clicking and not starting, most likely a dead battery.
The Battery is shot and you need to replace it.
Maybe flat battery?