If you have to change your Suburban’s alternator, never install a lower voltage alternator to replace the original component. You should always use an alternator with at least as high an output as the old alternator. Ideally, however, you should upgrade to a higher output alternator if your vehicle will operate electrical components that weren’t originally included, such as high powered lights, custom sound systems or snow plows.
Tools Used: Tools, Wrenches, Ratchet and sockets, Large wrench or breaker bar, Torque wrench set to 37 foot pounds
Upgrade a Alternator
Open the vehicle hood and disconnect the negative battery cable. Rotate the accessory drive belt tensioner counterclockwise with a large wrench or breaker bar, and slip the belt off of the tensioner.