Z4 M Coupe Alternator

[saul0]

Hi all 

The previous owner of my car replaced the voltage regulator on the alternator, but it looks like they have used the wrong part and it gives me a 2E7C code. On further inspection, I found the alternator connection plug dangling in the engine bay and the wires have been spliced with only one wire connected to the voltage regulator. 

Does anyone have the wiring diagram for the alternator, would really like to get it back to OEM? 

The next question should I leave it because it’s working!

 

[Bruce88]

hey man - i got the same issue - did you ever change it?

 

[Benji]

The OP doesnt make sense, how can the plug be dangling but has a wire connected to the alternator...?

I recently replaced the regulator on my alternator and it only had one pin in the plug - the old regulator had 2 pins, but there is only one wire that connects to it so doesnt make any difference, havent checked to see if I get that error

 

[Bruce88]

The OP doesnt make sense, how can the plug be dangling but has a wire connected to the alternator...?

I recently replaced the regulator on my alternator and it only had one pin in the plug - the old regulator had 2 pins, but there is only one wire that connects to it so doesnt make any difference, havent checked to see if I get that error

View attachment 32256

Awe Benji - yeah I hear you not totally clear. Are you running a z4m ? My car had that 2e7c when i got it - the only BitSerial comm on the z4m is the Alternator, when you swap out the regulator and check codes, it would be interesting to hear if the 2e7c came up. I'll check my alternator cables this weekend too and see if I can pick up anything significant! best regards

 

[Bruce88]

The OP doesnt make sense, how can the plug be dangling but has a wire connected to the alternator...?

I recently replaced the regulator on my alternator and it only had one pin in the plug - the old regulator had 2 pins, but there is only one wire that connects to it so doesnt make any difference, havent checked to see if I get that error

View attachment 32256

Hey man, u come right?

 

[Benji]

Hey man, u come right?

Sorry for not responding, my alternator works perfectly well on the Z4M with the new valeo regulator. I feel like the car is more "electrically stable" now, but that could be a placebo effect. When I attempted to check for codes, I realized my battery was weak, so in the process of charging it up, I got distracted. I have not yet checked for codes again, will try get around to it over the weekend

 

[Bruce88]

Sorry for not responding, my alternator works perfectly well on the Z4M with the new valeo regulator. I feel like the car is more "electrically stable" now, but that could be a placebo effect. When I attempted to check for codes, I realized my battery was weak, so in the process of charging it up, I got distracted. I have not yet checked for codes again, will try get around to it over the weekend

sick brother man - got the valeo part now too - gonna wrench on saturday - will post on here too if i get more info

 

[Mytfine]

Some regulators with the 2 pins require a signal from the ecu to excite and start charging and another pin for the charge light on the dash. Most are just one wire, as they are self exciting.

If its charging and doesn't throw and error code you should be good.

 

[Benji]

Some regulators with the 2 pins require a signal from the ecu to excite and start charging and another pin for the charge light on the dash. Most are just one wire, as they are self exciting.

If its charging and doesn't throw and error code you should be good.

I must say, many on the forum do not need a pin for self exciting...

Sorry, but I had to

 

[Mytfine]

I must say, many on the forum do not need a pin for self exciting...

Sorry, but I had to

🤣

 

[Benji]

Since this part number is difficult to find online, here it is, Valeo 593873