did your car come standard with an alternator? mine has a generator and had already proved difficult to switch it to an alternator..
Hope this helps. Compliments of Ron.
"It's very easy. Get a 50 amp (roughly) from any W116,W123 W114 car. They all
have a built in regulator and the amp output will be written on the housing.
You will need to turn the generator bracket upside down so the pulley lines
up with crank pulley .
You will also need to slot the rear hole in the bracket so the bolt lines
up. Next ,a tube to act as a spacer on the long bolt will be needed to fit
between the rear of the alternator and the rear of the generator bracket and
the generator belt adjustor will need to be extended so you can tighten the
belt . You will to extend it about 4".
The wiring is simple , One large wire to battery connection and the small
wire connects to the small blue wire to earth the generator light. You need
this to be connected for the regulator to work. Make sure the alternator is
in a earth circuit so the housing is grounded to the engine.
The generator regulator can be removed and the large wire feeding the
battery from the regulator (D+) is connected to the large wire from the
alternator. Its on the firewall. There blue wire should also be there.
(1.5mm DF) .The brown wire from the generator to the regulator can be cut
off (D-) .Depending on what size alternator you find ,you can fit anything
as long as that large battery feed wire is big enough to carry the load. The
original W111 wire is 4mm dia. Cheers!"
I also read somewhere that since the starter takes power from the battery, you can run a power cable from the starter to the alternator, eliminating the longer cable from the battery to the alternator. Everything else is the same. This is what I am going to do.