Hi, well you are persistent. I am curious how you tested the latching relays (old and new)? Attaching an Intellitec latching relay manual with detailed descriptions of how their latching relay functions and at the end is a troubleshooting section which has a schematic of the on/off controls for the relay. If the relays function properly when out of the coach say using a 12vdc car battery charger as a power source (to operate or release the latching relay NOT across the main lugs) then it may be control wiring from your use/store switch. Before tearing into that (if not too late) use your multimeter to check for 12vdc on the latching relay coil terminals when operating/releasing the relay. The switch should be a momentary up/down and center off position. It reverses battery polarity to turn latch on or turn it off.
https://www.intellitec.com/assets/pd...-100_rev_c.pdf
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