I agree. Load test battery first. If it's an FLA with pop tops, check each cell with a hydrometer. May have a bad cell in it. If all is good with the battery, I believe the alternator is up front. Easy Peasy. I would go with a brand that gives you a lifetime warranty. I think Autozone does, Napa, etc. Shop around. No sense spending all that $$$$ on a Denso with a car with over 200k on it. I have a Napa in mine for 4 yrs. Works fine. An 06' Camry 4cylinder. Not too many toys in it to burn it out.... The hardest part is moving that serpentine belt, then 2 bolts and wiggle it out. Then I bought a $5 ammeter that plugs into 12 volt outlet. Has 2 USB ports on it too. Displays the output of alternator, rather than waiting for the idiot light to come on if it dies. Alternators give you signs of death when they drop below 12 volts for a minute, but not enough to trigger the dash light.,,,and you can watch for overcharging...Nice LED readout. Scamazon.