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#1
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What is this little Alternator part? On Bosch AL-117x.
I've been having trouble with my alternator on my 78 300d. I replaced the voltage regulator but that didn't help. So I decided to get a new one and upgrade to the al117x since it was the easiest upgrade to do.
The real problem here might be some faulty wiring placing an extra draw on my battery, but I had already ordered this so I'm going to give it a shot. Anyways, I've attached a pic of both alternators. The new one is missing a little piece that plugs into the positive terminal - can I just use the one from the old alternator? Does it matter that they aren't the same model? Or could this little thing be the problem?
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1980 300D, 128K |
#2
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The "little piece" is a capacitor for noise suppression. Did you have the old alternator tested or do any voltage checks of your own, before replacement?
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
#3
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Yes, it was in the 13's for the most part when I tested it. Someone here suggested a parasitic load draining power when the car is off. I had already ordered this part so I figured I'd put it in first. Also, diagnosing a parasitic load sounds like looking for a needle in a haystack
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1980 300D, 128K |
#4
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X2.
Some MB alternators came with it and others not. My understanding is its supposed to keep the radio from picking up static from the drivetrain.
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You can't always get what you want, but if you try sometime you just might find you get what you need. |
#5
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alternator is in. it's at 14.10 at idle. i guess that's ok? i don't know whether or not to unplug this battery overnight or risk it.
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1980 300D, 128K |
#6
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To see if there is a draw when the car is off, I unhooked the negative battery cable and measured with a multimeter between the negative terminal of the battery and the cable. I'm not sure if I'm using the multimeter correctly but when it is set to 200A, I get a reading jumping around between 65-75.
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1980 300D, 128K |
#7
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... I doubt you have a 200A multimeter... they are pricey. you could have a 200A indirect meter, does it have a clamp on it? more likely you have 200mA setting. 65-75mA would be totally acceptable draw.
take a picture of the dial on the meter and post it here.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#8
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here's a pic of the meter. thanks.
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1980 300D, 128K |
#9
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yes, now that i think about it, i meant milliamps, not amps!
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1980 300D, 128K |
#10
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i've been through a lot with the battery and alternator, so i'm paranoid about this now. i think i'm going to unhook my bsttery every night.
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1980 300D, 128K |
#11
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Bingo!
Quote:
There are aftermarket battery terminal switches that you can install to disconnect the battery easily each night, if you cannot find your parasitic load. Good luck.
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1968 220D, w115, /8, OM615, Automatic transmission. My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear). |
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