W108 Alternative Alternator - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 08-04-2010, 08:55 PM Thread Starter
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W108 Alternative Alternator

I love stereo gear, so naturally I plan on putting a sweet stereo in my 1972 280se 4.5. I went to the local auto electrical parts shop and gave them my old alternator and asked if they could come up with something to get me more amps. They came up with something that might work and ordered it for me. It arrived and i brought it home to find that it was nearly a drop in fit for my 4.5. When i say nearly drop in i mean i had to remove about 20 thousandths of an inch from one end of the mounting lug, a couple of minutes with a file. It puts out 90 amps and is internally regulated, which is a nice plus. It is ac-delco part number 334-1836. It is a replacement part for a audi 4000 or a volkswagen quantum. I thought others may be interested as it is most likely a cheaper alternative to the original Bosch and also puts out more power, for all of your 12v needs. Here are some pictures

w108 alternator pictures by salexl_photo - Photobucket
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post #2 of 10 (permalink) Old 08-05-2010, 10:34 AM
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Cool!!! I've been planning the restoration of a 300 for some time, and this fits in with my plans. How much was the alternator? Was it a specialty thing from your shop, or a buy-it-from-Napa kind of thing?
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post #3 of 10 (permalink) Old 08-05-2010, 11:05 AM Thread Starter
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I imagine you could get one from napa, it is just an ac-delco part. I saw them on rock auto as well. They are listed on rock auto under a 1987 volkswagen quantum.
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post #4 of 10 (permalink) Old 08-23-2010, 06:49 PM
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Good info to pass on. Years ago when I converted from generator to alternator on my '65, I had a stock one wired for I think 60 amps for the same reason you did this. This could def. be helpful to others on here. Later.

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post #5 of 10 (permalink) Old 08-25-2010, 03:05 PM
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Very nice!

I was going to have to find this very information in a couple months, I am officially ahead of schedule now! Thanks!

1972 280SEL 4.5 W108.068/M117 V8
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post #6 of 10 (permalink) Old 08-25-2010, 03:34 PM
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did you end up upgrading the power plug that goes into the alt? i ask this because you can also get more power from your alt with larger gauge wire from alt to batt. if you have done this i'd love to know how you did it. i also found a shop on ebay that sells reconditioned alts for higher voltage i'll put up the links later, i'm at work right now.
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post #7 of 10 (permalink) Old 08-25-2010, 11:22 PM
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Quote:
Originally Posted by benz280se View Post
you can also get more power from your alt with larger gauge wire from alt to batt.

?? I'm not sure I understand that. An alternator is rated at a certain voltage and amperage, and using thicker wire won't change that. If output wire is too thin, it would overheat and either self destruct eventually, or cause an electrical fire under the hood.
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post #8 of 10 (permalink) Old 08-26-2010, 12:09 AM
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well it is part of what is known in the car audio world as the big three. you upgrade your alt wire to the bat, the ground to the bat, and the chassis ground, preferrably to 0ga wire. the whole reason behind this is your electronics of the car plus the stereo are going to tax 8ga wire, while your car will probably not catch on fire your amps will starve for power. having bigger ga wire helps the current flow freely without restrictions.i am not an expert but wires are rated to carry up to a certain amount of current, the smaller the wire the less current it can hold, the bigger the wire more current. thats why when you see big amps that truly put out thier rated power like a two thousand watt amp will have terminals for 0ga wire in for both ground and hot and no less than 4ga. some of them even have two power and two grounds for extra current pull. replacing the wire does work, in my 560 sec i put 0ga wire everywhere (i also have second battery) and wiith a a system totaling about 1800watts my lights dont dim at all. whereas before when i just had the smaller wire they did dim. most people wont need a second battery but i plan on upgrading to a 2500watt bass amp soon. just think of it like this if you had to push a load of rocks would you like to push it through a crawl space or a tunnel?

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post #9 of 10 (permalink) Old 09-27-2011, 02:59 PM
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Hi I have been habving issues with my alternator. I upgrated to one with an internal voltage regulator. What did you do about the plug? The original plug fits round pegs that were in the old alternato. The one I have now is flat so I used just some crimp on clamps, but I think I have the wiring all screwed up...
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post #10 of 10 (permalink) Old 09-27-2011, 07:16 PM
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Quote:
Originally Posted by Grubeguy View Post
?? I'm not sure I understand that. An alternator is rated at a certain voltage and amperage, and using thicker wire won't change that. If output wire is too thin, it would overheat and either self destruct eventually, or cause an electrical fire under the hood.
True - but before it does that you will loose some voltage over a under sized wire when running it at max current. You are going from a 30 A alternator to a 90 A one (3x) so you might be pushing it. But in fact you are probably not going to be running it near 90A.

In general I would not worry although one time I did see a friend short his out for a brief period (less than a minute) and it melted the wires inside his wire harness. The car was as if hollywood special effects guys had rewired it. It was totally messed up - horn honked when he turned the wipers on, headlights came on and off randomly and much worse. But that was a true short making the wire very hot and burning the insulation off inside the wire harness.
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