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Yes there is a relay in the under fuse box for the rear defroster grid.
Part Name: Multi Purpose Relay Part Number: 13A025A Part Description: 40 AMP, 5 Terminals, Black, Mini, Multi-Function Relay
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I just checked at www.fordparts.com and that part number is XXXXX good...Im adding the Rear defrost curcit and thats why Im asking
Are you looking at the same page, I am.