It's more likely to be behind the 120v load center (breaker box), but that may also be the location of the converter/charger on a Coronado. The 120v breakers and 12v fuses are in the same place, according to the owner manual. It doesn't say anything about the transfer switch or converter, though. One reference I saw claims a '94 Coronado has a Magnetek 950 converter/charger, so that would be separate from the breaker panel (the 950 is a deck mount converter).
The sure way to find the ATS is to follow either the genset cord or the shore cord until you find the place the two come together. That's the ATS. If that's not practical, follow the main feed wire into the load center (breaker box) backwards until you find it.
*** This topic from 2012 asks the same question and the ATS was eventually found to be behind the load center breaker panel.
http://www.rvforum.net/SMF_forum/index.php?topic=56800.0
