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Old 08-02-2012, 01:39 PM
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Join Date: Feb 2012
Location: Orange County CA
Posts: 195
AL129X in a 1981 300sd

I checked my alternator yesterday after my car failed to start from installing my ac system... I figured the extra strain made it finally kick the bucket.... but instead i saw 16.5 amps at idle... I think i also fried my battery... ouch... anyway i am just going to install a AL129X series....

can i wire this into the wire hub on the inner fender... or does it need to go all the way to the battery...

Does my current pulley work direct fit... i have read that it works good on a 300d so i felt confident...

any write ups on a 300sd all i could find a 300d
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Old 08-02-2012, 06:08 PM
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Join Date: Sep 2004
Posts: 9,038
Thumbs up

I routed my main feed to the battery, the small wire to 'excite' the alternator is back to that same OE terminal block. Bolts to the SD the same as the D.

Nothing really to the upgrade. Hell, that alt fits the 560 with a simple reclock.
I'm not a doctor, but I'll have a look.

'85 300SD 244k
'87 300SDL 251k
'90 300SEL 325k
'91 560SEL 189k

Eight others from IH, BMW, GM, Ford, and Volvo.

Liberty will not descend to a people; a people must raise themselves to liberty.
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Old 08-02-2012, 08:32 PM
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Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
I don`t think there is all that much difference between the "D" and "SD".
When I installed the one in our "D" I removed the wiring harness from the alternator to the terminal with the 3 screws by the battery, and used it as a template to make a new harness, and increasing the wire size. I did run an additional wire from the terminal block to the battery.

there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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Old 08-03-2012, 12:20 AM
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Join Date: Feb 2012
Location: Orange County CA
Posts: 195
thanks.... I have been doing some reading on this swap on another forum and someone recommended turning the housing in the back so the lead doesn't hit the motor... and also adding a second ground strap for the increased amperage...
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Old 08-04-2012, 02:43 PM
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Join Date: Feb 2012
Location: Orange County CA
Posts: 195
i finished my install today... I used new 10 gauge wire to the wiring block and had to buy two new belts that are size 15 41 5 which gave me ease of putting on and perfect tension without cutting anything to get the alternator to fit....
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