I have a 2007 Tundra CM SR5 5.7 with 185k on it. A couple days ago the truck wouldn't start. All I hear is a click from the starter solenoid. Tried jump starting without any success. Decided to buy a new 24F battery and the truck fired right up without any issue. After a day of driving, the voltage meter is bouncing all over the place. At a stop light, the needle is a quarter under the half mark and feels like the engine is going to stall. Once I give it gas, the needle moves back up just pass middle mark. While driving, the needle is back to normal. The battery clamps are clean and no corrosion. Could it be the alternator going bad?