What should the voltage be on a Mercedes alternator?
The role of the Mercedes alternator is to charge the battery with 14 volts. This voltage should not drop below 13.5 volts even if there are additional components using the Mercedes alternator. The voltage regulator on the Mercedes Benz alternator could be old and therefore malfunctioning when the engine is started.
Can a new alternator run over 14.5v?
Bought a replacement alternator but I am sending it back as I measured and have seen it running over 16.5V. The manual says the regulator should keep it to a max of about 14.5V. I put a brand new and fully charged battery in at the same time the alternator was changed, so I don’t think the battery can be blamed.
How much does it cost to replace a Mercedes alternator?
The cost of an original Mercedes Benz alternator would be over $500 however, most shops may allow a discount up to the $350 range. This is because the cost of a re-manufactured Bosch alternator is approximately $350. The labor hours involved to test the charging system and to replace the Mercedes alternator would be approximately 1.5 hours.
What should the voltage be on a bat alternator?
Measure the voltage across the battery and the big bat alternator terminal to alternator case. There are two things that you are looking for. The charging voltage should be between 13.9v to 14.4v. Also the voltage at the battery and the voltage at the alternator should be within 0.5v of each other.
Why does my alternator not change the voltage?
If the voltage change and go back to normal when you tap it lightly with a hammer while the car is running – the Carbon brushes are worn out and needs to be replaced in the alternator, or the whole alternator. Sometimes there is an electrical problem in the alternator, and even if the voltage does not change, it might be damaged.
What should I do Before I replace my alternator?
Before you replace the alternator make sure that your battery is not the problem. One thing you can do to troubleshoot your car is to go to Advance Auto Parts or AutoZone and have them do a FREE alternator / battery check. This test may be able to point you in the right direction. 3. Secondary Battery / Auxiliary Battery.
What happens when the serpentine belt fails on an alternator?
The serpentine belt powers the alternator, and if it fails, the alternator will stop working the moment your belt wears out and breaks, or the pulley becomes damaged. This can also happen if the serpentine belt is not tightened correctly. Most cars have automatic tensioners, but these can fail, so it is better to double-check.