How many fuses for secondary battery

[murph 10+ year member]

So I will have a fuse on the positive wire from the first batt do I need one before I connect the positive wire to my second batt? Also should I put one from my positive from the second battery to the amp? Sorry for the questions just want to make sure it is all safe.

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[Falcons 5,000+ posts]

it would be ideal to put one close to the first battery, close to the second battery, and then close to the amp/second battery.

 

[murph 10+ year member]

it would be ideal to put one close to the first battery, close to the second battery, and then close to the amp/second battery.

is it necessary to have two on the single line between the two batteries?

 

[Falcons 5,000+ posts]

is it necessary to have two on the single line between the two batteries?

it is recommended to fully protect your system, but most people just put one near the front battery and call it a day

 

[slim2fattycake 10+ year member]

what happens to the secondary battery if the positive wire from the first battery to the second battery is grounded?

 

[murph 10+ year member]

what happens to the secondary battery if the positive wire from the first battery to the second battery is grounded?

why would you ground your positive wire

 

[Chrispy 10+ year member]

If you don't fuse both batteries there's no point in fusing one. Say your positive run shorts out it will blow the one fuse and then your left with the non-fused battery to cause a fire.

 

[murph 10+ year member]

If you don't fuse both batteries there's no point in fusing one. Say your positive run shorts out it will blow the one fuse and then your left with the non-fused battery to cause a fire.

in short I need 3 fuses thanks everyone for the help

 

[Chrispy 10+ year member]

in short I need 3 fuses thanks everyone for the help

If your amp has internal fusing and you feel safe about the positive from your second batt to the amp will never short you could get by without a fuse there.