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03 X5-ECU Not Turning on Alternator-Zero Voltage at Connector
New to me 2003 X5, 4.4. I knew there were electrical issues when I bought it and trying to sort them out. Just had the alternator rebuilt by a very reputable shop. I am NOT getting any voltage at the plug from the ecu to the alternator. So the alternator is not turning on. Can anyone confirm: 1. What voltage should I have at that connector when unplugged from the alternator. The rebuild shop told me I should have 12v at that connector. I have zero. 2. What fuse is related to the alternator. Nothing references alternator/generator on the fuse map. 3. Any tips on troubleshooting the turn-on wire for the alternator? Edit: Car starts and runs fine, just drawing battery power. Last edited by Explorerlyon; 01-25-2022 at 10:03 PM. |
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
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Quote:
Now that I know the fuse is good and which fuse it is, I guesss the next option is to trace the wire back from the alternator to wherever it goes and hope to find something amiss. Last edited by Explorerlyon; 01-18-2022 at 10:28 PM. |
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I think the alternator excitation shares the wire with the oil level sensor but also goes through the dashboard.
Usually somebody a little smarte than me will show a picture of the wiring diagram. Sent from my iPhone using Tapatalk Pro
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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Digital Competition Systems The older I get... The faster I was... No Fear |
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Do you have 2 wires (green and blue) in the small connector? And 2 matching connections in the alternator?
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) Last edited by 80stech; 01-18-2022 at 09:12 PM. Reason: wording |
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Not to muddy this thread, but in case it points to other items to look at, I also have this: I have not found an antenna or control box yet for a compustar system. It only locks and unlocks the doors. The prior owner said the original remote stopped working so they got this compustar remote instead. I have yet to dig under the dash to see what exactly this system is. I have focused on getting the alternator working and proper power to the car. Last edited by Explorerlyon; 01-18-2022 at 11:01 PM. |
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Are you testing the green or blue wire? Are you testing with the connector connected (back probing.) Green comes from fuse F-5 which has a fair bit of stuff on it. Blue goes to the DME but through an additional connector.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
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Quote:
Ignition on: Blue: 11.84v Green 12.10v Engine Running: Blue: 11.9v Green 11.31v I do not have a way to back probe the connector (but just ordered some new test leads to do so in the future). I have to conclude that my newly rebuilt alternator is not good. I will pull it out (again) and go have it tested and rebuilt. My concern was the computer was not telling the alternator to turn on. Battery voltage: 12.54. Car running my voltage measured directly on the alternator terminal (+) and case(-) is also 12.54. No change to voltage when I rev the engine. The rebuilt alternator tested good when I picked it up. I hope something in the car is not killing the alternator regulator. I appreciate all the help |
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My 2nd last alternator lasted one drive. VR went out on the second drive. That was a Bosch. I had the same concern after I read that the oil level sensor can kill an alternator. I switched back to valeo. That one lasted until my car was killed by a deer.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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