Re: [DML] Re: lRe Grounding Schematic.
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Re: [DML] Re: lRe Grounding Schematic.



On Thu, Mar 22, 2012 at 11:36 AM, content22207 <brobertson@xxxxxxxxxxxx>wrote:

> **
>
>
>
> http://sphotos.xx.fbcdn.net/hphotos-ash4/309893_282221628489761_100001057778755_861272_225725998_n.jpg
> *THAT* is where the instrument cluster is grounded (and the fuel pump,
> among other things). It is an unfortunate design because it places too much
> demand on a single ground wire. Non other than Rob Grady himself told me
> that is what melts Fuse #7 (remember: DC electrons flow from negative to
> positive -- Ben Franklin got it backwards). If your grounds are inadequate,
> it's the positive side that heats up.
>
>
Hi Bill,

That is not how it works. Yes, electrons flow from negative to positive,
but that has nothing to do with a fuse heating up and/or melting.

The fuse heats up because the load on the circuit is more than what it's
supposed to handle. As you put more load on a fuse, it's resistance
increases, which causes it to heat up. At some point, the fuse is supposed
to blow.

If you run it at just the right amount of current though, it'll get hot
without blowing, which is what happens to the #7 fuse. That's why replacing
that fuse with a larger capacity fuse solves the heat/fire problem, without
compromising safety.


[Non-text portions of this message have been removed]



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