[Healeys] Fuses

[Tom]

Bob,

Thanks for the pointer to the BCF discussion.   For anyone who's
interested,  here's a link to the discussion from two years ago:
https://www.britishcarforum.com/community/threads/battery-fuse-protection.115642/
 It's a long thread, and worth the read for points both philosophical and
practical.

- Tom

On Thu, Mar 11, 2021 at 11:59 AM Bob Spidell <bspidell at comcast.net> wrote:

> I'll bite: I think you'd need a 'slow blow' fuse, like on the OD for
> instance. I usually buy batteries with the most CCA--cold cranking power,
> more current is available at higher temps--I can find/fit; some have 600A
> or more CCA (IIRC, the AGM in my BJ8 has over 700). An inductive load, like
> a motor or solenoid, pulls almost all current available for a split second,
> until inductance increases impedance. You might very well blow this fuse
> every time you try to start your car.
>
> There was an exhaustive discussion on this on the BCF; IIRC the conclusion
> was a fairly complex breaker system would work best. The simpler answer is
> to just make sure your cabling is in good nick; a lot of damage can happen
> even before a fuse blows. To my knowledge, most/all modern cars have no
> protection on starter systems either.
>
> Bob
>
> On 3/11/2021 8:14 AM, Tom via Healeys wrote:
>
> At the Monday evening Tech Call in hosted by the  AHCA New
> England chapter, one caller recounted the story of the hot wire from the
> battery to the the starter grounding out against the chassis, the
> insulation worn out from decades of chaffing.   Needless to say, lots of
> smoke and heat were generated.
>
> After 50+ years of use, it's surprising we don't hear more stories like
> this.   Is there a reason we shouldn't add a fuse?   Fuses like this style 500A
> fuse
> <https://www.amazon.com/Baomain-ANL-500A-Electrical-Protection-Holder/dp/B072PCPN1Q/ref=sr_1_4?dchild=1&keywords=500A+fuse&qid=1615478836&sr=8-4> range
> from 30A to 600A.   That seems like enough power to run the starter and
> still provide protection against direct short damage.
>
> What does everyone think?
>
> - Tom
>
>
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