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#1
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Only Charging at 11.3 V
Hello - My '06 E350AWD is only charging about 11.3V while idling. I assume either the Alternator or Voltage Reg is bad. Is there a easy way to tell which one to replace?
Thx |
#2
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What is the voltage at 1500 rpm
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#3
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Hello - Thx for responding! I checked and got 11.3v at 1500rpm, 11.5v at 2000 & 3000rpm and 11.6v at 4000rpm (but it dropped back down to 11.4 or 5 after a few sec). BTW, At each step I was holding it for 5 sec or so without seeing any change. IMO, It is not charging, but I don't know if it's the alternator or the V.R. - thanks again for the help in deciding which it is!
Happy Thanksgiving! Larry 06 E350AWD Last edited by l_turn9; 11-20-2020 at 01:47 PM. Reason: clarification |
#4
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Doesn’t sound like your charging at all. Not sure if the regulator is serviceable on that alternator.
Never mind I looked it up, it is. $40-$60 I’d probably just change the whole alternator and call it done
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1993 e300 1995 e320 1994 e320 2006 s500 4matic 2004 Jeep wj overland 2001 Ducati 748 2004 Honda shadow aero |
#5
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Thanks! Replacing the Alternator is likely the best option.
I will hopefully be back on the road again soon. Now, I have to find out how much trouble it is to replace. Normally, I wouldn't hesitate, but even with the plastic covers removed it still looks like a PITA. Oh well, it is what it is and I'm not in a hurry. (fortunately). I'm sure DieselBenz will probably say the same thing. I won't order one for a couple of days just in case he says something entirely different (which I doubt). Happy Thanlsgiving! |
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1993 e300 1995 e320 1994 e320 2006 s500 4matic 2004 Jeep wj overland 2001 Ducati 748 2004 Honda shadow aero |
#7
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On the diesel discussion a member pointed out the alternators use a Lin bus communications on these alternators. He had purchased a napa rebuild but the Lin bus was no good so he ended up buying a new MB alternator. I think I would change just the regulator based on his experience.
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#8
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Thanks DieselBenz! BTW, I owned (and loved) a 91 300D 2.5T for years - it finally died from rust around the rear suspension but a fellow Forum member bought it and repaired it. I would have hated to see it go to the crusher. My present Benz (gasser) is certainly lacking in many ways.
Ok, so replacing just the alternator might do it. Hmmm.... I guess there's no way for the amateur to benchtest a VR? Larry |
#9
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It's the brushes that wear out. You need to remove the VR to inspect. The fact that voltage is low indicates a bad VR. You could get it tested free at some auto retailers and have your battery checked out as well.
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#10
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Start simple first.....Also check the tightness of the belt. Though you would likely hear telltale signs of the belt- and the VR and/or alternator sound like the most likely, never just assume without knowing all possible failures that could cause such symptom.
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1990 190E 3.0L |
#11
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Only Charging at 11.3V
Quote:
1. - check the brushes and 2. - check the VR. What would I be looking for if I remove the VR and inspect it? Is it possible to test it with a DVM? If yes, please remember, I am a amateur when it comes to t'shooting via DVM. Keep it simple please. Thx Last edited by l_turn9; 11-24-2020 at 05:23 PM. Reason: clarification |
#12
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The length of the brushes, new would be about 3/4 inch long, once they get to about 3/8" approx then time for a new VR. Voltage should be 14.1
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#13
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Brushes are part of the regulator.
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra |
#14
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That is the VR note the carbon brushes are the wear items.
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#15
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Thanks for the image and info! Excellent Info. BTW, can just the brushes be replaced? (just out of curiosity) ;-)
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