Eddie,
I bought a used one that looks like the above picture.
If it's exactly the same as the above Rev. G, then it's a Rev. G.
No power is coming through the Variable 2 port. I tried changing it to fixed and still no power. Are there fuses and if so, where
If it's a Rev. G, there aren't any fuses. Every successor to the Rev. G has had fuses, however, the Rev. G did not.
or will it be a diode gone bad as mentioned earlier in the post.
It could be any one of several failed components.
I have a trolley I'd like to run at a slow speed. Is it possible to hook up a transformer at a lower output to a fixed channel so it will just run at a constant speed.
Yes, you could connect a lower-voltage source to a Fixed channel. However, the trolly won't necessarily maintains constant speed unless it has speed control, or the track is both straight, with no curves or grades, and the voltage is constant across the entire length of the trolly's route.
