Electrics & Electronics: Charging, Starting & Lighting: Charging procedures
Checking a charging system
 
Always follow any manufacturer's personal safety instructions to prevent damage to the vehicle you are servicing.
 
Removing & replacing an alternator
 
The alternator must not be operated with the battery disconnected or the terminals at the back of the alternator disconnected.
 
Inspecting & adjusting an engine drive belt
 
A belt that has been soaked in oil will not grip properly on the pulleys and will slip. If the oil contamination is severe enough for this to happen, replace the belt.
 
Replacing an engine drive belt If you don't have a tension gauge, you can estimate the tension by pushing the belt inwards with your hand.