FW: Fuse Amperage??? for a fuse between the battery and the car.

[Jim Green]

--- Richard J Lebens <rick-l at rocketmail.com> wrote:
> This is an interesting question.

Sure seems that way.

> Doesn't a starter motor present pretty close to a
> short to the battery
> (600 amps limited by the source impedance of the
> battery)?

I feel bad for your starter if it's pulling 600 amps.


> Won't a fuze this size let 3-4 times it's current
> rating through for
> several seconds before it melts?

Possibly, depending on the fuse.  Some will blow
instantly, some will have a delay.

> Does this mean
> with a 175 amp fuze
> you can crank your car for 5 seconds at 600 amps but
> it blows after
> that?

No, I ran a 110 amp fuse for more than a year with no
problems, until I accidently started the car in gear.
There were countless times when I would crank the
engine for over 10 seconds doing compression tests,
timing adjustments, fogetting to hook up the coil, you
know.

>  Will it interrupt the fault before the energy
> in the battery is
> depleted?
>
> What is the resistance of your rear seat springs and
> associated
> fittings?  How much damage will your prevent with a
> fuze in series?
> Will a fault blow the fuze(what is the resistance of
> the fault)?
>
> In our litigious society why aren't they standard
> equipment on all
> cars?

I've seen a few cars with them stock, but in most
cases the wires aren't more than a few feet long, so
there is no need.  It's when that wire catches
everthing else around it on fire that you have a
problem.

=====
Jim Green
'89 90tq 034EFI, Haltech IG5
http://www.geocities.com/jeg1976/car_home.html

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