Alternator amperage

Asked by GuruXSDJL Oct 26, 2018 at 10:43 AM about the 2004 Jeep Grand Cherokee Laredo

Question type: Maintenance & Repair

What is the correct alternator amperage to supply
power to a 2004 jeep grand cherokee...i have 55
amp now and doesnt charge battery

1 Answer
42,870

Hornet_2497 answered 5 years ago

The standard alternator for your Jeep is rated at 135 amps and it only takes 5-10 amps over a short time to fully recharge any battery. The extra amps is to run lights and accessories. I don't know where you come up with 55 amps, but a good alternator will deliver 1-135 amps depending load (voltage drop) and engine rpms. Have your battery tested and the alternator too and see what's going on.

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