What is the sub woofer size on a 1999 mercury mountaineer?
The sub woofer size on a 1999 Mercury Mountaineer is 5 inches by 7 inches. Speakers are located in the front and the rear of the vehicle.
The speaker sizes for 97-2001 mountaineer that would make a stock fit would be a 5x7" speaker for front and rear. The Ford/Lincoln/Mercury company is notorious for using this size. You can also double check those kind of figures for any vehicle on crutchfield.com, a leading online audio/video company.
You don't mention what model year of Mercury Mountaineer so I was looking at various model years The Owner Guides show that the Motorcraft BXT-65-650 battery was used most ( that's BCI group size 65 , 650 cold cranking amps ) * some model years have an 850 cold cranking amp battery shown as the optional battery