The one black wire is connected to the traction control relay

Two black and one red wire coming out of module. Has a fusible link and a relay

Top module is the original one, bottom is the new one. That has the three wires coming out of the module.

I am replacing the RCM and see that I have these 3 wires coming out of the module. The new one does not have this. Does anyone know what this is for?

 

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Your relay control module (RCM) was previously modified for some reason. The new replacement is not. You should just plug the 5 plugs into the new RCM (which would remove the added relay bypass that was installed in the old one). Seems your not the first owner who bypassed the component inside the RCM? IF your trouble was the RCM, the new RCM should correct it. Hope this helped.

I've never seen an RCM part number like the one on your replacement. Are you sure it is for an SLK-320 equivalent? Good luck!


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Thank you for your response, I have just put the new module in and remove the wires that were attached to the old module.
Replaced the module because the fuel pump relay was not working.
I do not know who or when the bypass relay was added.
I purchased the module thru Parts Geek.
I now have the ABS and BAS/ESP lights staying on, any ideas?
Thank You Steve

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Some thoughts:
1) I do not buy parts for a "Crossfire". I buy parts for a "2003 SLK320 Mercedes", PERIOD.
2) The RCM you had was, as you have been told, "hacked"/modded/messed up. My question is this: WHY? I can't tell from the photos exactly what they added a SPST relay for or what it does.

Now, a question:
There are four wires going to the added relay - three go into the RCM - where does the other one go? If you dont' show/tell us that, we can't help you. Your car is modded in a way we have not seen before. I agree that restoring the car to "factory" is a good idea, but unless you first determine what the added relay does, you cannot proceed. The fact that traction control lights are on is a good clue - DRIVE THE CAR and then tell us:

1) Does the speedometer work?
2) Does the car seem to drive normally?
3) EXACTLY what lights are on? (A photo helps.)

If you do not answer all that I have asked, you will not get much help, again, we have NO CLUE what was done to that car. We cant rely on the service manual alone, your car is modified. I suspect some sort of "Traction Control Cutout" mod was done but I am GUESSING.

 

I'd like to make a suggestion. It is common to modify a car. But its not right to sell a modded car and not tell the buyer that its modded.

I suggest you find the person you bought the car from and punch them in the mouth.

 

Hello, the third black wire was spliced into the orange/white wire that goes to the "c" plug on the module.
We have had this car for several years and purchased from a dealership.
I have not been able to drive it yet as I am replacing the fuel pump and filter.
I will post any updates.
Thank You
Steve

 

Ok, plug "C" has two wires in it
- Red/Yellow carries power to the Brake Controller.
- Red/Dark Green carries power to the Transmission Control module and Shift Lever Assembly (Which do not exist in a manual transmission car.)

I think they had a bad traction control relay and did the dumb thing - wired in a relay instead of putting in a new RCM. If you restore the wiring to the RCM to what it was from factory, a new RCM should work fine.
But I can't say for sure, so many black wires make it confusing.