sounds like your starter moter is worn out
a flat battery
Your battery is weak, or your your alternator is not charging battery.
I think it is a dying battery
Loose battery or alterator connections
A car battery causes the headlights to shine
Your alternator may not be putting out enough Amps to charge your battery and run your headlights as well. You can test this by measuring the voltage from the battery with a multimeter. With the car running the volts should be around 14 or more on a 12 volt battery. Try it with the lights on too.
Could be a few things, weak alternator, bad battery, bad wiring. If you have a subwoofer in your car with no battery cap that will certainly do it.
usually the headlights have a fusible link near the battery but check for power to the highbeam switch and headlight switch first.
Because the power for your headlights is pulled from your battery. When the dashboard lights dim after turning on the headlights the dashboard lights aren't getting as much power as they were with the headlights off. With the motor running or off? The headlights draw a lot of current, but should not visibly affect other systems. There could be a problem with a worn out battery, an alternator that isn't charging correctly, or you have a bad earth between the battery and the chassis. Check the large cable connection between the battery (usually negative these days) and the bodywork, or between the engine block and the bodywork.
A dead cell in the battery or something is on, such as the headlights. A stuck relay will also cause this. More likely than not, the battery has a dead cell and needs replacing.
it is caused by the alternator voltage regulator switching on and off to charge the battery, this problem is encountered on many makes of car, you may not of noticed it before prior to exchanging the battery.
The cause is the voltage regulator within the alternator (working normal). When the voltage higher it is charging the battery like after you start your car or have the headlights and wipers on. The voltage regulator keeps your battery charged up. In order to charge the battery, voltage must be higher than battery voltage.