This is a common preventative replacement item as these engines age. No instructions are available at this time but there is plentiful information online to guide you in replacement. Consider checking and or replacing the voltage regulator at the same time as it is easier to get the alternator off when the water pump has been removed. The video below will show you how to inspect it by removing the drive belt.
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M112 V6 M113 V8 Belt Tension Release and Drive Belt Install Custom Tool
Designed by Kent and made right here in our shop. Watch the video below for a full explanation of this tool and how it works. Kent will demonstrate how easy it is to remove and replace the front drive (serpentine) belt on most M112 and M113 engines from 1998 to 2006.
2000 to 2006 M112 V6 and M113 V8 Belt Tensioner with Pulley
Quality aftermarket part. If over 80,000 miles, replace this part when you replace your serpentine belt. Kent's custom tensioner tool is available separately below to help make the install of this new tensioner a "snap."
Late Model Voltage Regulator for most M112 and M113 Engines
THESE ARE GENUINE BOSCH. Do not purchase the cheaper aftermarket regulators as we have found they do not last. This voltage regulator that bolts on to the back of your alternator. This is the common failure point and when it does you will not be getting any charge to your battery.