Marc,
I don't think you need an additional fuse, the 14 AWG is usually good
for 15 amps so the breaker will protect the wire. The 10 AWG is good for
about 30 amps. If the switch is rated for 10 amps it might hold. When a
motor first starts there is an in rush current that is higher than its usual
loaded current, this might tax the switch. If you have a doubt I'd suggest
having the switch bring in a relay that has a higher current rating which in
turn would bring power to the pump. You'd probably want to make sure that
any relay you used was approved for marine use due to gas fumes.
Paul

"Marc" wrote in message
...
I'm wiring up a 6 amp Sealand T 12 waste pump for my holding tank
discharge. I have a dedicated 10 AWG branch with a terminal block in
my head from my miscl. 12 volt circut off a 15 amp breaker at the
panel. It is a 4' run from the terminal block to the pump and I am
using 14 AWG.

I want to install a keyed switch for the pump and I have a Cole Hersee
10 amp on/off ignition switch that I want to use. Question A: Is the
switch appropriate? Question B: Should I fuse the leg between the
terminal block and the switch?