What size fuse is recommended for the inline holder? Shawn January 10, 2017 17:38 The SR-955HPC, SR-655HPC & SR-447HPC2 use a 15 amp fuse. Related articles What fuse do I need for the SR-955HPC? Fuse size (amps) for SR-497HPC? Will 8 gauge automotive wire soldered to the regular 12 gauge power cord hurt the radio? SR-655HPC Setup Guide I'd like to buy the CTCSS for the SR-955HPC, where can I buy one? Comments 0 comments Article is closed for comments.