It is SO hard to find an auto shop that has someone who understands the difference between current and voltage, who can use an ammeter to find current draw or who can troubleshoot ANY electrical problem.

Hell, when I worked at TransComm, (a Motorola Radio shop) we often got cars in from the Ford and Dodge dealers. If a car came in draining the battery, they paid US to find the problem and either fix it, or tell them what module to replace.