Maybe something is getting shorted because of screws that are too long/in wrong place??
Is there any way you mixed up the connectors??
If the problem only happened after you messed with it then it's likely something you did and are missing.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)