Fuseable Battery Cable?

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In preparing my car for the ITC Convention in Dayton this year I have been making sure all the wires and cables are in good shape and have the correct information in place.
There is a fuse or diode in the negitive battery cable. Can Can anybody tell me if this is stock and what does it do and where does it connect to?
I cannot find any information.
Please send to my email. Thanks

Stock, there is no fuse, diode, or anything else like that in the neg batt cable. Are you by any chance seeing the small black electrical connector that comes off the neg batt terminal? If so, that is the EEC ground, and is VERY important to the operation of the car.