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Hi Harry M.....you must be frustrated about all this by now, but you have proven that bumping the latch relay (near the converter) has supplied coach battery (momentarily) to your fuse panel/coach DC loads. This new test relay sounds like it is just operating as a regular relay and not a latching relay. The latching relay when operated holds the main contacts in a certain position (closed or open) until operated again with reversed battery/ground on the coil. If your test relay is a latching relay then it is not latching.
If we are talking the normal coach AC power transfer switch......that is used for transferring 120VAC from either the shore feed or the generator feed into the converter AC input. You said on shore power the lights etc works; and also said the generator wont crank at all (another problem). The generator normally controls the transfer switch when it starts generating 120VAC; after a 30 sec delay it causes the transfer switch to operate which disconnects shore power and connects generator power to the converter. I think you have been complaining about DC coach batteries not connecting to the coach fuse panel and converter DC output.
When you test your latch relays outside the coach....and they click make sure the relay is mounted with tower up straight and verify there is continuity between the main terminals after the coil power is removed. You could use the ohmmeter function to do that (but do not use ohms on live circuits). If no continuity try flipping the coil battery; click should be heard; then disconnect battery and try continuity again. I am probably not explaining things very well.
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