Delco 21SI and 22SI style Alternators

These are the popular Delco 21 and 22 SI replacement units found on many types of heavy duty applications. We are producing them in 160 and 200 amp 12 Volt versions. This is much better than the 100 - 140 amp units provided by the factory. They are a 1 wire design (needing only the battery output cable) so they can be used for a large number of installations. We also have them available in a 24 volt configuration.

These alternators are sold outright (no core required). Choose from the mounting style you need below.

                  J Mount                              Quad Mount 

NEW - We now have a better (newer technology) replacement for these older style Delco units. The Delco 28SI series alternators. Click on the link at the bottom of the page.