high output alternator for 300E - PeachParts Mercedes-Benz Forum

Victor300E · #1 08-12-2005, 11:41 PM

Hello everyone
I just wondering where I can find higher output alternator for my 90 300E.
Are there any other alternators from lets say 420sel or 560sel fit? Or 400E maybe? I know that engines are different but still. Also does anybody now what is OEM 300E alternator output and 400E outputs are? And which alternators will fit 300E without major modifications to give me more amps?
Thank you

mike690003 · #2 08-12-2005, 11:56 PM

I had a 200 AMP alternator installed in my 300E. They used my stock bracket and extended the alternator pully a little. That was all that was needed to make the alternator fit. The stock alternators are only 70 amps, so once I installed my subwoofers, the factory alternator could not handle the drain. My alternator was a GM heavy duty unit, that cost me $150 and $50 installation, and I did't need a core. The MB 70 amp unit was $195 w/core and $295 without it. The GM alternator gave me no problems, and I can't imagine the amount of accessories I could've installed in the car with that alternator.

danwatt · #3 08-13-2005, 04:57 AM

Hmm, what is the part number of the GM alternator? What engine is it off of? I might need to look into getting one.

mike690003 · #4 08-13-2005, 04:24 PM

The alternator looked a lot like this one:

http://cgi.ebay.com/ebaymotors/Chevy-Buick-Olds-High-Output-200-AMP-Alternator-7860-7_W0QQcmdZViewItemQQcategoryZ33573QQitemZ7991617822QQrdZ1

MTI · #5 08-13-2005, 04:46 PM

The 143 amp alternator from the S-Class will also fit a six cylinder M103, just have to mount it so that the wire harness clears.

brabus3.6 · #6 08-13-2005, 09:37 PM

Check this link W124 alternator upgrade. 150A will work but it must have the old style (pre-2003) voltage reulator with a B+ post and a D+ post not the 2-prong new voltage regulator.

Victor300E · #7 08-15-2005, 12:43 AM

Thanks for info guys.
Ill try to find one from s-class. Mike did mechanic used same pulley used on GM alternator and extended it out? And did all mounting openings lined up with stock openings?
Thanks
Victor

ACM · #8 08-15-2005, 01:34 AM

Victor,
if you find a solution I am very ionterested also.
please let me know.
I got an 88 300E
thanks

mike690003 · #9 08-15-2005, 09:35 AM

Mike did mechanic used same pulley used on GM alternator and extended it out?

--->Yes he used the same pulley from the GM unit. He just extended it out a few millimeters.

And did all mounting openings lined up with stock openings?

--->I don't know if this was just luck, but when he put my old mount on it, the thing lined up perfectly.

lino · #10 08-15-2005, 12:42 PM

This might interest you..check out the pics also pn page 2:

Alternator Options - I need Help!!

1991300SEL · #11 08-15-2005, 03:27 PM

Maybe not the ultimate amperage increase, but I replaced my existing Bosch AL66X with an AL166X. The former is 80 amp; the latter is 100amp.

I used to see about 13.95v-14.0v on a cold engine idling first thing in the morning using the AL66X. I now see about 14.25v-14.30v using the AL166X.

My 2 cents.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
560SL High Idle and Aux Cooling Fan Problems	harcar	Tech Help	4	05-23-2003 01:41 PM
Sometimes high...sometimes low..	KylePavao	Diesel Discussion	5	03-30-2003 05:47 PM
No High Beams	rebootit	Diesel Discussion	1	03-15-2003 12:48 PM
High Oil Pressure	Joseph_H	Tech Help	22	03-04-2003 12:07 PM
Estimating INCREASED horsepower output?	Ken C	Mercedes-Benz Performance Paddock	3	04-02-2001 08:47 PM