I thought about your problem for awhile last night. If I may offer the following
isconnect your 7-pin umbilical lead.Make sure everything in the coach is "off"---fridge, H2O pump, H2O heater, lights---this will eliminate any potential "parasitic draw"/possible feedback issues on the coach side. With a multi-meter set to "volts" and your key "off' and door closed, check each pin on the tow vehicle's recepticle. If I did my homework correctly, the only "hot" pin should be your 12 volt Power (charge) pin. The rest of the pins should read "0" volts. Now, turn on your key and close the door. Read your tow vehicle pins again. Your Power (charge) lead should be hot and, depending on how your Dodge is wired, possibly the clearance light pin should read 12 volts. Your brake pin should read "0". If you get a brake pin reading, then the problem is between the brake controller & the recepticle. Start the engine and leave the door open. Check your pins again. If you notice any "pulsating voltage" especially on the "brake pin", you've found the problem. Its isolated to the Dodge; you have a feedback problem or a poor ground connection. If all of your readings are normal, then plug-in your umbilical lead. If you still get the ticking with the key "off" and doors closed, then you may have a crossed/shorted wire in your umbilical lead between the 12 volt Power (charge) wire and the brake control lead on the coach side. If you have a clamp-on amp meter, leave the unit plugged in and clamp around each brake lead by the wheels. If you get a reading, then you have isolated the problem to the brake control circuit or the 12 volt circuits in the coach. With the unit still plugged in, disconnect your 12 volt coach battery (s). This step will positively eliminate any 12 volt loads in the coach---propane alarm included as well as a possible faulty break-away switch.If the ticking stops, you have the problem narrowed down to the coach wiring system. If the ticking persists with the coach plugged in and your 12 volt coach system isolated (turned off), I would wager its a controller wiring problem as everything else has been isolated. Too bad you don't live in So. Cal---I would enjoy helping you troubleshoot the systems----kind of a challenge for an old "gear-head".