Car will not crank , but will with a jump. It stays on but when I go to cut light on it bogs down and dies. I just replaced alternator. Maybe the battery?

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your vehicle. If your Civic starts with a jump but dies when you turn on the lights or start driving, it does sound like a battery issue, especially since the alternator is new. You may also have a poor electrical connection somewhere in the circuit. If the battery is weak or has lost its ability to hold a charge, it may not provide the consistent voltage needed to keep the engine and accessories running. A failing battery can cause the engine to bog down when the electrical load increases, such as when the lights or other accessories are turned on. Before buying a replacement, you might have your current battery tested at a parts store to confirm if it's the source of the issue. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!