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Another quick thing to try I's to unhook the alternator and observe the amp draw.
Will do tomorrow and I do have a brake controller but I should have disconnected it when I pulled the aux fuse under the hood.DRL diode can go bad and I do believe it is powered with key off; haven't studied the circuit whatsoever but a friend that I trust had advised me to not swap the diode with the battery connected as you can damage the new diode. Anyway it's the heat-sinked device behind the dash roughly above the area of the driver's side of the transmission hump. Try disconnecting the battery, then disconnect the diode. Hook battery up and see what your results are.
If this doesn't affect anything...do you have a trailer brake controller? Try disconnecting it. I've seen them go bad and draw power when they shouldn't.
Richard