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Red battery warning on e55 AFTER new  alternator > Red battery warning on e55 AFTER new alternator
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Red battery warning on e55 AFTER new alternator

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Old 07-17-2017, 02:06 AM
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Red battery warning on e55 AFTER new alternator

replaced the alternator on my e55 and now when I get on the power the voltage drops to 11v and I get the red battery warning! Just cruising the volts stay at 14v and everything runs fine! Is it a blown fuse or something else? Anyone else?
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Old 07-17-2017, 06:20 AM
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How old are your two batteries? When I started having voltage problems, I had to replace the rear battery as well as the alternator. The front battery had been changed a year before.
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Old 07-17-2017, 09:06 AM
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I honestly don't know anything about the E55 specifics but could that be a loose belt ? when you get on the gas the belt could be slipping ?

at steady cruising belt is not slipping ?

Just a thought...

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Old 07-17-2017, 12:09 PM
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Could you possibly you have a faulty alternator?

"This will be the second alternator being parts warrantied and the fourth time I've pulled one out of the car. Alternator measures ~14v at the back on start-up, but as soon as the a/c kicks on, it drops down to 11.5-12v and doesn't recover."

But I would think about doing a load check on the battery and verify it is healthy.

I am thinking it is the alternator though


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Old 07-17-2017, 03:08 PM
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Originally Posted by Blade Canyon View Post
How old are your two batteries? When I started having voltage problems, I had to replace the rear battery as well as the alternator. The front battery had been changed a year before.
the rear is maybe 1.5 years old! Idk about the front
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Old 07-17-2017, 03:10 PM
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Originally Posted by BoostedAero View Post
Could you possibly you have a faulty alternator?

"This will be the second alternator being parts warrantied and the fourth time I've pulled one out of the car. Alternator measures ~14v at the back on start-up, but as soon as the a/c kicks on, it drops down to 11.5-12v and doesn't recover."

But I would think about doing a load check on the battery and verify it is healthy.

I am thinking it is the alternator though


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but even with ac on and all that it still stays at 14v just cruising! Idk if maby it's a fuse or the front battery is too old!
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Old 07-17-2017, 04:26 PM
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As others have said it was actually the BATTERY that destroyed my alternator due to a dropped cell. So be very careful and get both batteries checked out as you could kill another alternator here.
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Old 07-17-2017, 04:37 PM
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Have your voltage regulator checked out as well...
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Old 07-17-2017, 11:30 PM
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Originally Posted by mightar View Post
Have your voltage regulator checked out as well...
The alternator is brand-new and so is the voltage regulator
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Old 07-17-2017, 11:31 PM
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Originally Posted by austingtir View Post
As others have said it was actually the BATTERY that destroyed my alternator due to a dropped cell. So be very careful and get both batteries checked out as you could kill another alternator here.
just hooked up a voltmeter and the alternator is charging find under load. I went ahead and replaced the small auxiliary battery and will drive it around for a bit to see if the issue comes back. What's also weird is that my oil level sensor is bad now too. Is the sensor just a plug and play or will oil come out if I replace it?
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Old 07-18-2017, 04:18 AM
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Originally Posted by Mr-AMG View Post
just hooked up a voltmeter and the alternator is charging find under load. I went ahead and replaced the small auxiliary battery and will drive it around for a bit to see if the issue comes back. What's also weird is that my oil level sensor is bad now too. Is the sensor just a plug and play or will oil come out if I replace it?

A voltmeter wont really tell you much at all about the problem I am talking about. You need to either buy a battery testing machine (not that expensive for a cheap one) or goto a battery retailer and they should have the right test equipment. I use a solar branded one similar to the one in the video below. These testers can also test alternator with car running and do a cranking test they are very good for quick diagnosis on issues like this.

I think you might be very surprised if you saw those batteries on a proper tester. A dropped cell will do damage to your alternator and wont show with normal testing on a volt meter.



In my experience its just not worth the hassle to mess about with these things and try to guess it. There is to much electronic **** to wreck in this car to dick about with it.

Last edited by austingtir; 07-18-2017 at 04:30 AM.
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Old 07-18-2017, 04:45 AM
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Originally Posted by austingtir View Post
A voltmeter wont really tell you much at all about the problem I am talking about. You need to either buy a battery testing machine (not that expensive for a cheap one) or goto a battery retailer and they should have the right test equipment. I use a solar branded one similar to the one in the video below. These testers can also test alternator with car running and do a cranking test they are very good for quick diagnosis on issues like this.

I think you might be very surprised if you saw those batteries on a proper tester. A dropped cell will do damage to your alternator and wont show with normal testing on a volt meter.

https://www.youtube.com/watch?v=Oi8sUE9XCgA


In my experience its just not worth the hassle to mess about with these things and try to guess it. There is to much electronic **** to wreck in this car to dick about with it.
i had the ac, driver and passenger heated and cooled seats on, defrost, headlights, fog lights and high beams and it was still at 13.5-14v the whole time! The alternator isn't the issue! The small aux battery was only showing 12.5v so I went ahead and replaced it! The main battery is less than a year old and is oem Mercedes
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Old 07-18-2017, 12:33 PM
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I had the exact same issue and after replacing the aux battery it fixed the issue. None of my creature comforts stopped working and voltage was fine the whole time.
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Old 07-18-2017, 01:47 PM
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Originally Posted by Mr-AMG View Post
i had the ac, driver and passenger heated and cooled seats on, defrost, headlights, fog lights and high beams and it was still at 13.5-14v the whole time! The alternator isn't the issue! The small aux battery was only showing 12.5v so I went ahead and replaced it! The main battery is less than a year old and is oem Mercedes
You have to understand the car's sub-systems. You just replaced a perfectly good battery.

The auxiliary battery is not tied into the main electronics system all the time. The K57/2 relay must be energized to connect the auxiliary battery to the main electrical system. So, you were measuring the battery voltage while it was disconnected from the circuit.

This K57/2 relay will activate in event of main battery or alternator malfunction. With a properly functioning system, the relay will only activate once per ignition cycle to allow the auxiliary battery to charge through the relay.

Auxiliary battery voltage is monitored by a polyfuse and the BCM (Battery Control Module). The above mentioned activation once per ignition cycle (for "a short period of time" or <15 minutes IIRC but I need to verify) will occur after you key on and start the car.

So, connect your voltmeter to the auxiliary battery, measure voltage, then start car and monitor voltage. If the K57/2 relay is good, you should see the voltage increase when the BCM activates the relay thus tying the auxiliary battery into the charging circuit. If no increase, good possibility you have a bad relay and that is what is triggering the dash alert.

Star diagnostic system should show the source of the fault. You're going to want to look under Control Units/Body/Battery Control Module/Maintenance operation, adaptations, or exchange/Fault Codes.

The relay is located under the plastic trim of the windshield wiper cowl next to the cockpit air intake next to the auxiliary battery.

PM me your email address and I'll send you some info to assist your trouble shooting if you would like.

Good luck on it and please post your findings.

FWIW, I use a Solar BA-5 battery tester (looks like a Solar battery tester in the video) to monitor the health of my batteries. Hasn't steered me wrong yet. When my batteries measure CCA at half the new rating, out comes the old battery and in goes a new one.

Last edited by bbirdwell; 07-18-2017 at 02:10 PM.
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