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ML320 2002
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17 Posts
Discussion Starter #1
Hi,

The alternator in my car needs to be replaced.

The old alternator is a bosch 120amp (part # on back is 0124 515 056).

I could not get another bosch and instead got a valeo 120amp (part # SG12B023).

On the back of the valeo there is only a B+ screw connector and a socket / plug receptor.

I cannot see a screw connector for a D+ on the valeo. Is this correct?

thanks
 

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Premium Member
02 ML320 06 ML500
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17,105 Posts
It's apparent that you need a Bosch alternator since the Valeo has a different set-up. Return it ASAP and get a Bosch, or just replace the voltage regulator on the back of the alt. which is very easy.
 

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Super Moderator
99 ML430, 00 ML320, 05 E500 4matic Wagon
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22,146 Posts
And ironically Valeo has Bosch make the Valeo branded alternators. I have also seen the
issue mor606 has posted. I am not sure why Valeo did not "clone" the connector setup
but it is what it is.
Return it like 43 said as not compatible.
Here is the Bosch Reman at Amazon with free shipping for $235
Bosch AL0787X Alternator : Amazon.com : Automotive
 

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ML320 2002
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17 Posts
Discussion Starter #4 (Edited)
I checked the back of the bosch alternator on the car.

There are 2 connector posts.

One connector with a plastic cover (I guess the B+) has wires connected.

The other is painted yellow and has no wires connected - just a nut screwed on!

So this would explain why the Valeo only has a B+ post.

Besides the B+ post it also has a socket / plug receptor the same as the Bosch.

I think the Valeo should work.

Agree?
 

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ML320 2002
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17 Posts
Discussion Starter #5
I removed the bosch alternator from the car.

The second post was labelled b+ and had now wires connected. So that is why the valeo alternator only has the single b+ post.

I installed the valeo and it works fine.

Output volts is approx 13.5 - 14v as per specification. Output remains constant with lights on high beam.

The battery has charged sufficiently now to start the engine.
 
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