What should the cold cranking amps be for a 1999 ford mustang?

There's no single CCA rating for a 1999 Ford Mustang battery. The required CCA depends on the engine size (and thus the starter motor's demands) and whether it's a V6 or V8. Also, the battery's age and condition will influence its actual CCA.

To find the correct CCA, you should:

* Check your owner's manual: This is the best source. It will specify the recommended battery group size and CCA range.

* Look at the existing battery: The CCA rating is usually printed on the top or side of the battery itself. This tells you what the *previous* owner used, which is a good starting point.

* Consult a parts store: Provide them with your Mustang's year, engine size (3.8L V6 or 4.6L V8), and they can look up the appropriate battery specifications and CCA. Online parts stores like AutoZone, Advance Auto Parts, or Napa Auto Parts also have this information available by searching for your vehicle.

Don't just focus on a single number; make sure the battery you choose meets or exceeds the recommended CCA for your Mustang. A battery with a higher CCA than recommended is generally fine (it just means it has more reserve power), but one with significantly lower CCA might struggle to start your car, especially in cold weather.