Yea, I forgot about that. I had the formula for watts to amps in my head, but
I forgot that if I took the resistance of the defroster I could get my power
needs that way. BTW, does that work for horns too? Is it as simple as finding
the resistance of the horn?
--
James Nazarian Jr
71 MGB roadster
71 MGBGT-V8 in need of paint
01 Impreza 2.5RS
A complex system that does not work is invariably found to have
evolved from a simpler system that worked just fine.
On Wed, Jun 06, 2001 at 11:52:54AM -0500, R. O. Lindsay profoundly declared:
>
>
> James Nazarian Jr wrote:
>
> > Listers,
> >
> > Can anyone tell me how much power (in amps or watts) the defroster on the
>GT draws? I am building the harness for my V8 and would like to put the
>proper fuse on this component. If anyone can measure one that works I'd
>appreciate it.
>
> Paul, check me on this but if you have a multi-meter you should
> be able to work it out.
>
> I = E/R
>
> where,
>
> I is current in Amps, the units fuses are rated in
> E is voltage. 12 Volts in this case.
> R is resistance in Ohms. This is what you can read on your meter.
>
> Measure the resistance of the defroster coils. This should be a
> rather small number so good, tight connections between the meter
> leads and the defroster connectors is paramount.
> Should you read 3 ohms, the current is 4 Amps. This does not
> mean that you should fuse it at 4 Amps as that is the operating level,
> hypothetically. Paul can give you better advice about the best fusing
> level. I would use 50% over the operating level IF the wiring will
> support that current load. I suspect that the current will be noticeable
> higher so the resistance will be smaller. Being in the denominator
> of the equation, the measurement error becomes enormous.
> Paul, comment?
>
> Theory is theory but 'noise' is not included. Being a big fan of
> empirical data, I would rather hook it up to a 12 volt battery through
> a high current ammeter and measure the load directly -- then fuse
> accordingly.
>
> --
> Rick Lindsay
> Diamond Geoscience Research
> 5727 S. Lewis Ave., Tulsa, OK
> Voice: +1 918-747-3456
> Fax: +1 918-747-8599
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