Hi Dean,
I have 3 Tiny Tims in running order with a 4th that I am currently restoring.They are all 12v 300watts, I believe that some were also made as 24v units.There are several videos of these units on Youtube which might help you,also there are entries on an American forum -Smokstak - which are useful.
Thay were made by Continental Motors corp,Muskegon,Mich.,USA.
I have been advised that they were used as auxillary engines in Allied tanks during WW2 to charge up the main engine batteries and to power the radios.
There are various 'manuals' about which give basic information .
Hope that helps you a little.
All the best,
Kev.