Dave,

Get the mini-blade 3 amp fuse. I use to have an inline 3 amp fuse (round cylinder type held in place with spring) but if the waves were really rough, it would lose power to my 1198. Now I rewired it with a 3 amp mini blade fuse and it will not loose power no matter how bad the waves are that day. You can get them at radio shack.

30A 12/24VDC Mini Blade In-Line Fuse Holder : Fuse Holders | RadioShack.com
3A Mini-Blade Automotive Fuse (3-Pack) : Automotive Fuses | RadioShack.com