The fridge requires a good 12VDC source to operate. If your batteries are toast, forget about the fridge working; the thermostatic functions, lights, etc., won't work without good house power. The fridge will cool using LPG, but it must have some way to tell when to turn off or on. For that, you must have a good house battery/12VDC system working.
The ignition lock is pretty simple: get a replacement ignition switch and keyset.
If I were you I would start with the house batteries: pull them, put them on a 6V charger, and see if they will hold a charge. You can take them into most battery stores for testing, too.
Test the charging circuit by measuring the voltage coming out of the leads when shore power is applied, the generator is running, or the engine of the motorhome is running. You should see 13.5 or more volts across the POS/NEG battery lugs when one of those conditions are met. If not, trace back to the house control panel to find out where the failure to charge is coming from. With an old unit the first thing I would be thinking is dead batteries. Get some good ones in there and then check your charging function.
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