I fear that I may be eating Nike tread once again.Your
logic is sound and your eloquence regarding the matter
speaks for itself! I am humbled! After I posted what I
did,it hit me.Doesn`t matter if the battery can supply
2000 amps.If the voltage is too low,the regulators and
such in the PCM will not operate until a certain
voltage threshold is reached.DUH!! The starter on the
other hand,would probably be happy with 10 volts,as
long as the current was there.(oops,there I go again!)
Steve P.
--- Shane Moseley <smoseley@ix.netcom.com> wrote:
> steve preston wrote:
>
> > Yes.You cannot have voltage without current.
>
> Uh - say what? The definition of voltage has
> nothing to do with current. It is a potential
> energy specified in volts. The potential for
> current exists. I realize V=IR (Voltage = Current *
> Resistance) - this is Ohm's Law. This is a
> relationship not a definition.
> Specifically: "The law stating that the direct
> current flowing in a conductor is directly
> proportional to the potential difference between
> its ends."
>
> Current will only flow when the resistance goes down
> between the terminals. A short (or no connection
> between the terminals) represents
> almost infinite resistance. In this case -
> virtually no current is flowing (I=V/R). You have
> voltage (or potential for current flow) but
> no actual current flowing. A load (like running an
> electric fan or pump) applied represents some lower
> resistance and can initiate current
> flow. A wire (or wrench 8) connected directly
> across the terminals represents pretty close to 0
> resistance which causes full current to
> flow from pos to neg. You should get a large spark
> if the battery is good. Not near as strong if it is
> near dead.
>
> > If the battery is at the right voltage unloaded
> and the
> > voltage drops too much when you apply a load,then
> the
> > battery has trouble supplying current.
>
> I agree. The power (P=VI=I^2R) is much less which
> is caused by low current (see equation).
> <snip>
>
> > Anyway,it seemed odd to me that
> > a battery could possibly spin a high-current
> > starter,and not go on to also supply low current
> > devices.
>
> Consider that charge is stored - and that potential
> can even rise (due to chemical reactions) when no
> load is applied. It is feasible that
> enough charge exists to drive the starter and crank
> the vehicle but enough of that stored charge is used
> up that the potential (Volts) and
> thus current flow ability is greatly diminished.
>
> > > They are not talking amps it is voltage that the
>
> > > computer is looking at.
>
> The computer is very sensitive to voltage level. It
> also sound like a crank or cam position sensor.
>
> Latr,
>
> Shane
>
> --
> '96 IndyRam-HisIndy-MPI TB Pulleys RTcam MPComp
> HVoilpump DynaGearDoubleRoller WindageTray CompTAs
> '96 IndyRam-HerIndy-numbered(#142)"Track Truck"
> '74 Triple-Black Dodge Challenger Rallye 360 EFI R&D
> vehicle
> '93 Dakota CC 318 - soon to be mine 8)
>
>
=====
Steve Preston 1999 Dakota Sport 3.9V6,4x4,3.92 Anti-spin,42RE auto,Intense Blue,regular cab.
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