What should alternator voltage be with battery off?
If the battery is faulty, your alternator tests will not be accurate. This should read a little more than 12 volts with the engine off. Next check the voltage of your charging system under load, the voltage should be within 13.2: 14.5 volts d/c.
What should voltage be for Mercedes Benz alternator?
Before performing any tests of your alternator, charge and test your battery. If the battery is faulty, your alternator tests will not be accurate. This should read a little more than 12 volts with the engine off. Next check the voltage of your charging system under load, the voltage should be within 13.2: 14.5 volts d/c.
How do you remove an alternator from a car?
Lower the alternator down a little so you can get access to the connections on the back. Unplug the harness (yellow arrow), pull the plastic cover off the cable connector (red arrow) and use a 15mm socket to remove the cable. Now you can slide the alternator out of the engine.
How to replace alternator in Mercedes Benz W203?
Turn the tensioner all the way counter-clockwise and insert a retaining pin between the rotating part and the tensioner base. If you do not have a retaining pin you can use a 5mm Allen. The alternator is held to the engine by two bolts (red arrows). Use an E14 Torx (red arrow) and remove the two bolts.
If the battery is faulty, your alternator tests will not be accurate. This should read a little more than 12 volts with the engine off. Next check the voltage of your charging system under load, the voltage should be within 13.2: 14.5 volts d/c.
Where can I buy a new alternator for my Mercedes Benz?
You can get a brand new MB altenator at the dealer for about $800 and have them put it in for another $200, of course the advantage is they will wash your car and give you a loaner. Or you can buy an remanufactured alternator from your favorite parts supply store for about $180, replace it yourself in about an hour (and that’s taking your time).
Lower the alternator down a little so you can get access to the connections on the back. Unplug the harness (yellow arrow), pull the plastic cover off the cable connector (red arrow) and use a 15mm socket to remove the cable. Now you can slide the alternator out of the engine.
Why is my alternator not working in my car?
Most of the time it’s the regulator and most places can’t properly check it. It could be a fuse and it could be the alternator itself. It might happen to be a bad ground connection. This is a sophisticated system but these are still basics. Progress through the easiest and cheapest.