Can you start the rig or has that battery died? No start issues described after rig has been sitting are typically low battery/bad ground related. Usually starting the rig (which combines the chassis/coach batteries) is sufficient to kick start the generator. Cleaning all the contacts on your battery may also be in order. Also - you might remove the harness to the control board and clean the contacts.
You could also have a bad spot on the starter solenoid. You hear the click of the solenoid,still reading 12V. means no current to starter,or thru starter
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