This is a link to a system of belt driving just about any PTO device, like a pump, air compressor, extra alternator (for fast charging), or hydraulics from just about any engine.

The article also give three methods of adding a second pulley to the front of any engine including a DIY method of adding a pulley in just about any bush location.

There is also a DIY method of perfectly marking where to drill the holes to match the engine without having to measure.

The article was originally written for boats, but it's the same for any engine.

The link is-
Second marine alternator



Hope it helps someones project.

Scott