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#1
01-23-2008, 01:14 PM
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alternator different from 79 to 81 on the 300D?
Greetings,
Is there a difference between the alternators on the 79 300D vs. the 81-85 alternators? I know that the glow plugs are different but I am not aware if that is the only major difference in the engines. My Alternator which has been on borrowed time for a while finally died and I need to buy a replacement today. The caveat is my 300D is a 1979 model with an 81 or later engine - replaced by the previous owner. Thanks in advance, Scott
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1979 Thistle Green 300D 272,xxx miles 1984 Orient Red 300 D 4 spd Euro Import - 189,xxx miles - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Lofat Productions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
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#2
01-23-2008, 01:24 PM
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NA's had a single belt, turbo's double. (I think). May not make a difference in buying an alternator because some come without any pulley's and you have to use the old one.
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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
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#3
01-23-2008, 01:38 PM
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Well that certainly helps. The Napa guy was saying he had one that was a double belt model which confused me since mine is only a single.
Thanks, Scott
__________________
1979 Thistle Green 300D 272,xxx miles 1984 Orient Red 300 D 4 spd Euro Import - 189,xxx miles - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Lofat Productions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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#4
01-23-2008, 01:58 PM
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Find a Bosch AL129X and install that one. It is a direct bolt in and will give you 115 amps! They were factory on the Saabs in the late 1980's
here is a thread on how to install it... "Alternator" 115 Amp Bosch AL129X works in 123s! You simply need to remove the pulley from the old alternator and use it on the new one (If it has a serpentine belt) and change the wiring from the junction box to this arrangement. One large 10ga or 8ga wire from where the two small wires were attached to the junction to the B terminal on the alternator (the large bolt) and one smaller wire from the terminal that went to the small blue wire the small bolt. I did it and it works great!
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#5
01-23-2008, 02:08 PM
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the 79 alt is only rated at 45 or 55 amps, the later ones are from 65 to 80 amps depending on model... I also think there were some different brackets on the older motor... not sure though.
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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!
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#6
01-23-2008, 02:27 PM
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Quote:
It made a huge difference going from 65 amps to 115 amps! I can run the radio, defroster, rear defroster, headlights and wipers without getting low voltages!
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad
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#7
01-23-2008, 02:37 PM
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On a side note, what is the purpose of having two pulleys? Safety so that if one breaks, you're not stranded? Why only on the diesel models (if so)?
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1989 300E 144K
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#8
01-23-2008, 05:14 PM
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well, I decided to go with the 81 alt since I just need to get the car back on the road with out turning it into a project. The guys at Napa had one in stock that was a single pulley where as the 79 was only available in a double pulley configuration.
One of these days I will look at the Saab conversion, but for now my needs are minimal and the 81 should suffice. Thanks for all the help! Scott
__________________
1979 Thistle Green 300D 272,xxx miles 1984 Orient Red 300 D 4 spd Euro Import - 189,xxx miles - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Lofat Productions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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