98 disco 300 tdi keeps blowing fuse #8 have un plugged, instrumentcluster, both taillights glove box light, have check tailer plug have also tried 2 different head light switches any ideas wat to try or where to look next?

98 disco 300 tdi keeps blowing fuse #8 have un plugged, instrumentcluster, both taillights glove box light, have check tailer plug have also tried 2 different head light switches any ideas wat to try or where to look next?