I believe that it is a ceramic fuse related to a/c and the fan. I had my indy switch out my compressor last year and converted to R134 (I know, I know...) and in the process he removed that fuse completely as part of a different switch set up he put in to accommodate the conversion.

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1987 300TD 231,000
#22, afterglow, plastic fan, euro lights, alternator upgrade, cluster housing update