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#11
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Sounds like voltage regulator or brushes to me Sent from my iPhone using Tapatalk Pro
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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#12
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Quote:
Just curious how long it took you to installed the water cool alternator on the m62
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2003 X5 4.4i w/ Sport Pkg, Cold Weather Pkg. 2010 X5 4.8i w/ Sport Pkg at 19,000 miles |
#13
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I "cheated" as the car was mostly disassembled for replacing the chain guides and vanos rebuild.
That said, once you have the fan and shroud off you should be able to swap the Alternator in less than an hour. Release the serpentine belt tension, remove about 345 10mm head 6mm bolts that hold it in and swap it. (The reality is about 9-10 bolts: keep track of where there are several lengths) The way the water cooled models work by the edge being held about every 2" around the perimeter into the wet opening where the coolant flows. I can't remember if the hoses are rubber or aluminum, if rubber they could be pinched off rather than draining the entire coolant system. Sent from my iPhone using Tapatalk Pro
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#14
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Quote:
0. Measure the battery voltage is at 12.5 1. Start the car and let it warm up so it idle in the 600 RMP. 2. Turn on headlight, seat warmers (all 4), fog lights, rear defroster, hazard light, radio, and wiper on max. 3. The voltage a this point is fluctuate between 11.8 to 12.3 4. Rev the engine at 1500 RPM, the voltage fluctuating between 13.4 - 13.7. 5. Voltage drop at the block to the negative post is 70 milivolt. At this point I am concluding that my alternator is not produce enough power when needed.
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2003 X5 4.4i w/ Sport Pkg, Cold Weather Pkg. 2010 X5 4.8i w/ Sport Pkg at 19,000 miles |
#15
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Quote:
Thanks for the helpful info to further troubleshooting.
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2003 X5 4.4i w/ Sport Pkg, Cold Weather Pkg. 2010 X5 4.8i w/ Sport Pkg at 19,000 miles |
#16
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I would look into replacing the brushes and slip rings
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#17
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I just did a load test on my 2010 4.8i
1. Base battery read 12.3 at the post 2. When idle with out load it is at 14.8 and 14.9 3. With load it is at 14 ish
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2003 X5 4.4i w/ Sport Pkg, Cold Weather Pkg. 2010 X5 4.8i w/ Sport Pkg at 19,000 miles |
#18
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For consistency I would use either OBD or the hidden menu 7. The drop in voltage in your last test is probably just the voltage drop on the wires.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#19
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I can't follow all of this. Without regard to anything else, engine on should give you 14.4v at all times. 13.6 is too low.
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#20
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Agreed. These trucks (at least the V8's), with a good alternator, will stay over 14v at all times.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
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