Honda VTX1800R Owner's Manual page 177

If a Fuse Blows
If you do not have a spare fuse and you
cannot ride the motorcycle without fixing
the problem, take a fuse of the same rating
or a lower rating from one of the other
circuits that you can do without
temporarily.
If you replace a blown fuse with a spare
fuse that has a lower rating, replace the
fuse with the correct rating as soon as you
can. Also remember to replace any spare
fuses that were installed.
If the replacement fuse of the same rating
burns out in a short time, there is probably
a serious electrical problem on your
motorcycle. Leave the blown fuse in that
circuit and have your motorcycle checked
by your Honda dealer.
168
Taking Care of the Unexpected