How Long Does It Take To Charge A Car Battery While Parked? Basically, at idle you can probably get 80 amps out of your alternator. You can charge a flat battery to 80 percent full in about 2 hours, so long as you alternator can manage produce around 14 volts at the battery terminals this
Can I Charge A Battery Without Disconnecting It? Yes – you can. Just be sure to connect the positive (red) wire first and be sure that your car charger has the correct setting(s) before you connect to the battery. As far as the car is concerned, all that happens when you connect the charger is
Does Amps Matter On Alternator? Does amps matter on alternator? That is, your alternator will only supply the amount of amperage a particular component demands—and no more. So high-output alternators will not harm your components or charging system, no matter how high you go with the amps. What size alternator do I need for 3000