Dometic AES Service Manual (2134KB) - Bryant RV Services

(118)Next, diagnose the switch by following theswitch diagnosis section of the A.E.S. manualwhich we have previously discussed. As a finalcheck in our diagnosis of the 120 volt circuit,visually inspect the refrigerator power cord. Ifnecessary check the cord end to end forcontinuity on the ground black and whitewires that make up the power cord. If nocontinuity is indicated on one or more of thepower cord wires replace the power cord.During this diagnostic step be sure that thepower cord leads are firmly connected to theAC terminal block.(119)NO 12 VOLT DC OPERATION. As wementioned earlier in the program, the ignitionlock terminal houses the wire connection thatcontrols the 12 volt heating element circuit andthe 25 minute delay cycle.NO 12 V.D.C. OPERATIONThe wire from this terminal should be routeddirectly to the run side of the vehicle’s ignitionswitch. This will provide DC voltage to theignition lock terminal only when the vehicle isin motion. It also allows the vehicle’s alternatorto keep the house battery charged andeliminates a possible dead battery due to thecustomer forgetting to switch off therefrigerator. Whenever the ignition key isturned off, the electronic control system willinitiate a 25 minute delay cycle. When thevehicle’s ignition is turned back on the systemwill re-energize the 12 volt DC circuit. Theignition lock wire, which is commonlyreferred to as the “tag line”, should be a wiresize of at least 16 gauge. The amperagedemands from the element are handled by thepositive and negative leads of the terminalblock, which necessitates the need for largerwire gauge requirements.A-6-40