Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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If you have lost all electrical power this is not a alarm issue. I would start with removing the battery cables from the battery and checking the connection to the both of them. Its common for them to look okay yet be corroded.
Before you let them do that , remove the cables from the battery and inspect the bolts that hold them on the battery to be sure there is no corrosion. The security system will not allow the engine to start but if it was active it will not cause any loss of complete power.