Hello Maude,
I have some original Bosch factory literature on the voltage regualator, and alternator for the 230SL.
There are more than one version alternator for the 230SL. The Mercedes number remained the same on all three versions, only the latest version is supplied.
(1) Alternator type K1(R)14V 35A20 Bosch # 0 120 400 505, Mercedes #002 154 4902, (used July 1963 to July 1965), Voltage regualator Bosch #0 190 601 003 Mercedes # 001 154 8406.
(2)Alternator type K1 (R) 14V 35A20 Bosch # 0 120 400 535, Mercedes #002 154 4902, (used Aug 65 to July 66), Voltage regulator Bosch # 0 190 601 003 Mercedes # 001 154 8406.
(3) Alternator K1 (R) 14V 35A20 Bosch # 0 120 400 608, Mercedes #002 154 4902,
(used Aug 66 to Jan 67). Voltage regulator Bosch # 0 190 601 006, Mercedes # 001 154 8406.
I have Bosch rebuild and test procedures along with complete individual parts lists with Bosch part numbers if needed.
Joe Alexander
Blacklick, Ohio