Can I talk battery chargers today without getting scolded?
They are indeed used to charge Vanagon batteries...

I have a Century 55/10/2A unit.
The 55 amp is for starting, the 10 or 2 for charging.
The 10/2A circuit does not work.
I was hoping the slide switch to toggle between the three amperages was bad,
but everything checks out ok.
I see a couple resistors and an IC mounted to a heatsink inside the box,
along with the transformer.

Any idea what could be wrong with this thing?