[Healeys] Another con - fused question

[Bob]

Conceptually this concept is flawed.   The fuse does not protect anything 
downstream of the
fuse except the wire!   If he fuse blows it does so because the device, the 
relay in this case,
has already failed or there is a wire short.  The fuse is sized to allow normal 
working with the
device or devices downstream.

To look at it another way...  In the Kitchen one tries to run the toaster, 
microwave, and the
coffee maker at the same time.  The fuse/breaker trips not because it protected 
any device but
it protected the wire from overload and the potential of an overheated wire from 
stating a fire.

That is the fuse function, to protect you and the wire, not the device....

Bob
55BN1

On 1/1/2013 2:03 PM, Richard Ewald wrote:
> Only items downstream from the fuse will be protected by that fuse.  So if
> you put the fuse downstream of the relay, the relay won't be covered.  If
> you put it upstream on the relay the relay will be protected.
>
>
> On Tue, Jan 1, 2013 at 11:01 AM, john spaur <jmsdarch at sbcglobal.net> wrote:
>
>> There are two white wires going to the OD relay. One comes from the fuse
>> block at A3.
>>
>> The other goes from the relay down to the overdrive switch on the dash. Is
>> this the correct wire to fuse?
>>
>> TIA
>> John Spaur