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#1
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300 SD Alternator?
My battery went dead. The local gas station tested my electrical system. They showed me some machine that said my alternator was putting out 11 or 12 volts. They said it should be 13, and that I need a new alternator, not a new battery. Does this sound right? How much does an alternator cost (1984 300 SD) and how many hours labor to install it?
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Jacob Wissler Jr., Houston, Texas, 1984 300 SD |
#2
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Details
The car seems to run fine. It has been over 100 degrees for the past few days, so I had the ac on driving around town. Everything was fine until I came out of a store and the battery was dead.
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Jacob Wissler Jr., Houston, Texas, 1984 300 SD |
#3
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Bosch rebuilt alternator for an SD is about $130.00 plus 75.00 core from Fastlane ,it's a straight foward DIY job,no tricks that I remember.That should disspell any rumors that MB parts are expensive......
William Rogers...... |
#4
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Install Alternator
How many hours labor?
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Jacob Wissler Jr., Houston, Texas, 1984 300 SD |
#5
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Does the battery light come on when you turn the key to position 2? If so, and it doesn't come on when the engine's running then I don't think the alternator's bad. It might be a bad voltage regulator which is considerably cheaper than a new alternator.
Sixto 95 S420 91 300SE 87 300SDL 83 300SD |
#6
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Alternator is pretty straightforward DIY job. No more than an hour.
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'85 300SD (formerly california emissions) '08 Chevy Tahoe '93 Ducati 900 SS '79 Kawasaki KZ 650 '86 Kawasaki KX 250 '88 Kawasaki KDX200 '71 Hodaka Ace 100 '72 Triumph T100R |
#7
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DIY?
What is DIY?
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Jacob Wissler Jr., Houston, Texas, 1984 300 SD |
#8
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Dirty,injury,yelling!
William Rogers......... |
#9
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Do It Yourself.
But William is right about Dirty, Injury, yelling also.
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87 420 SEL Looking for a nice mid 80's MB diesel. 87 BMW 528e (Sold) 99 TOYOTA 4Runner 1989 Honda Accord (Sold) 1988 Honda Accord (Total) |
#10
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Scam
I had my car checked out by someone else. The alternator and voltage regulator were fine. Only problem was a very old battery. It looks like the first place I went tried to sell me stuff I didn't need.
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Jacob Wissler Jr., Houston, Texas, 1984 300 SD |
#11
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I don't see why they would scam you on an alternator and not on a battery. It could be that the brushes on the alternator are bad and are connecting intermittently. I have never changed them myself but am told it is just a couple of screws and a 15 dollar part.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#12
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Money
They tried to sell me a rebuilt alternator, installed, for $275, and they knew the price (parts and labor) without checking. I think there are cheap alternators for less than $75. That means $200 for changing the part. On a $105 Interstate battery they might make $50.
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Jacob Wissler Jr., Houston, Texas, 1984 300 SD |
#13
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Jacob:
Although yours is a 126, my 140 just had the job done. If you read from the multi-meter that the current reads below 14.5 with engine running, your alternator is not pushing enough juice to charge the battery. Without the engine running, the battery should read at least 12.75 volts. Mind you, you should have all "normal" electronics turned on to test the alternator juice, i.e. A/C, radio, lights, ......... One more thing, you can change the "small" voltage regulator on the alternator to isolate the problems. Many have responded that the voltage regulator will fix the issue which is a small investment to pay. I have seen the regulators on e-bay. hope this helps... |
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