Battery

[Andrewt16adc]

I have just this week fitted a new bigger batter, i was using a 75 amp battery, but this week bought a new 100 amp battery from a dealer. Tonight i have come in to no power from battery on the meter gauge. I went under bed to find the fuse with 15 on it for the charger was blown. As i have fitted a new more powerfull battery do i need a a bigger fuse. There is nothing obvious in owners book about fuse required. I have a 2001 tourer i would not expected at that time of production that bigger batteries being available. I have put a new fuse into charger slot and things came back to life.

 

[ProfJohnL]

No you shouldn't need a bigger fuse. All you done is change the capacity of the battery (A bigger bucket) you haven't changed the charger, or the items that will use the 12V power, so the standard fuse should be adequate.

 

[Raywood]

The bigger batteries have been around for years and the 15 amp fuse should be sufficient. I do wonder if there is something else wrong here.

 

[bertieboy1]

A bigger capacity battery will take more charging current but should not be high enough to blow the fuse.
Check that you have connected the battery correctly - +ve to +ve and -ve to -ve.
If you connect the battery incorrectly this would cause the fuse to rupture.

 

[DrZhivago]

I have just this week fitted a new bigger batter, i was using a 75 amp battery, but this week bought a new 100 amp battery

I believe you mean 75 or 100 amp hours, not amp. Amp hours is current in amps multiplied by the hours the battery can supply it for. That might seem nit-picking, but I think it might be the cause of the misconception that you need a higher rated fuse. For a given usage pattern your new battery will give you more hours, not more amps.

 

[Dustydog]

I suspect you may have made an error in reattaching the various cables to the new battery. The blown fuse is probably due to a short circuit.