93 F250 keep blowing maxi fuse 9

Minuteman96

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Keep blowing fuse 9 on the truck. I narrowed it down to only when the truck is running, and when the fuze blows I have no tach or automatic on the tranny. I know this fuse protects the PCM and I checked relay 1, any known wires that would be causing this? Thanks for any help.
 

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