HELP!! Bad Voltage Regulator? - Page 8

MPDano · #1 08-22-2013, 12:02 PM

Quote:

Originally Posted by bcredliner

I was merely trying to help.

Your first response to my post sounded defensive that is why I read your original post again and then interpreted you weren't asking a question you were commenting that battery didn't fix the problem but you are sure the alternator will.

OOPSIE was intended as an apology for suggesting you needed help when your post didn't ask for it.

Your post is entirely out of line.

Yes, there is always one on every forum.

Sorry man, didn't mean for it to be defensive. I was merely pointing out two issues my wifes X5 is currently having and has had. Chasing electrical gremlins on these cars are usually tied right back to the Alt and then Battery. Trans comment was just adding another issue spoke about in this thread. So, google my username and you'll see I belong to many forums and that my sole goal on these forums is to help and find solutions for others to benefit. No need to continue

MPDano · #2 08-22-2013, 11:13 PM

Removed my Alternator tonight. Removed the Voltage Regulator from the Alternator to get a part number. Just bought a new Bosch Regulator for $45.99 shipped on eBay. NAPA wanted around $145 for one.

MPDano · #3 08-28-2013, 10:57 PM

Since I don't like to leave topics unfinished. Here is what I did. I installed the Bosch Voltage Regulator and reinstalled the Alternator. Checked charging was spot on. Got around 13.9 average at battery while charging. With car off, got around 12.5, keep in mind there is the Carputer powering down and all the interior lights are on. We're good to go now on a good battery and alternator.

Got another code. P0102. Maf is dying. It was just replaced 9 months ago, got a replacement under warranty today and installed it. Removed code. Took it for a test run, she ran as she did right off the BMW Dealer parking lot. All fixed.

MPDano · #4 08-28-2013, 10:58 PM

...the rest of the pics

bcredliner · #5 08-28-2013, 11:46 PM

Great!

Omerta · #6 03-05-2015, 07:28 PM

I'm getting some surging during idle. When I trace my Voltage vs Time it bounces between 12.8 and 14.3V at about 10 Hz or so.

Its either my voltage regulator or load related. Would the air compressor have enough load to effect the VR if it was cycling? I have no codes and the air system has been working fine.

Omerta · #7 03-06-2015, 03:02 PM

"full field" is putting maximum voltage to the commutator via the voltage regulator, with feedback to the VR.

You can't short circuit the VR. You need to inject voltage and amperage to the rotor through it in order to create the EMF to make the 14V/180A (dependant on load). The produced voltage will be dependant on the feedback loop to the VR.

StephenVA · #8 03-07-2015, 08:56 AM

Thanks for the corrected info on the Volt regulated system. Having been out of the bench repair world for many years I have not kept up on the proper test steps, especially as most parts have gone to the "vehicle test - Failed?" replace parts and all associated parts nearby, repair process.

ssx5 · #9 07-16-2016, 06:38 PM

Hello all
I am dealing withe the same tranny fail-safe prog issue

. Last weekend I had an Indi mechanic replace all the power steering hoses, reservoir and the front right side axel rod as my CV boot was ripped and leaking grease. Came home after driving 50 miles. Next time when I start driving I see this 'Tranny failsafe prog activated' message and obviously gears shift was rough. went back to the mechanic and he cleared all error codes and was fine for one trip to work before the tranny code came back.
My question is could the mechanic have touched or messed unintensionally with any other part - alternator that would cause this problem? Battery voltage shows 11.5v
Thanks in advance

upallnight · #10 07-16-2016, 07:10 PM

Quote:

Originally Posted by ssx5

Hello all
I am dealing withe the same tranny fail-safe prog issue

. Last weekend I had an Indi mechanic replace all the power steering hoses, reservoir and the front right side axel rod as my CV boot was ripped and leaking grease. Came home after driving 50 miles. Next time when I start driving I see this 'Tranny failsafe prog activated' message and obviously gears shift was rough. went back to the mechanic and he cleared all error codes and was fine for one trip to work before the tranny code came back.
My question is could the mechanic have touched or messed unintensionally with any other part - alternator that would cause this problem? Battery voltage shows 11.5v
Thanks in advance

When was the battery last replaced?

You need to bring it back to the mechanic and have him replace the battery. A battery that is only reading 11.5V is basically DEAD.