If it says to use 25, then use 25. Going bigger means providing less protection for the system.
ok im going to be installing an older alpine amp in my car soon. the manual says to install a 25 amp fuse. would using anything higher be detrimental? or should i strictly use a 25 amp fuse? most install kits come with at least a 30 amp. its not a problem to buy a 25 amp one just want to be sure.
alright thanks just what i wanted to hear
if there is a 25 amp fuse on the amp, i don't feel that it is too big of a deal to run a 30 amp fuse at the battery (this would is primarily for 'worst case scenario' things-- you get in a wreck and the power cable gets cut/pinched...). if the amp is not fused(as some aren't...), i would highly recommend using only what they recommend, any higher could allow the amp to hurt itself.
As per soundman and others - if the unit has its own fusing - which it will have (surely!?) - the upstream fuses are irrelevant.
Equipment fusing is to protect itself (else fail in a "safe" manner").
Other fuses are to protect downstream wiring only (ignoring discrimination; and undersized fuses that economically match the load).
yes the amp has its own fuse. i was talking about the inline fuse for the power wire to said amp. should have been more specific. youre saying the size of fuse there wont make a difference? thanks again.
it should be as close as possible.