BatV

[rr]

My brother did this on his car. Two cables, one to the engine & the other to
the starter. His car starts easily and cranks fast. I was also thinking that the

8 awg should run  from the J block to the battery. That way the cable drop
during crank won't affect the ECM.

All this time I kinda' thought he went over-board. . . Maybe not.

BobR.

P.S. And a thanks to all of the other replies. One less thing to worry about
now.

Bruce wrote:

> >From where the neg ties to the body (assuming it's a short run), run a
> second 1/0 to the engine.  Also, run one and perferably two grounds to the
> body.   While it might not change anything short term, long term you'll
> thank me.  Main power and grounds even to those that know how important they
> are, are often not done well enough.
>    I always have a single heavy battery ground going to the actual engine
> block, not the head, not the timing cover, the block.
>    In places where it gets cold, the first couple milliseconds the starte
> load is hundreds of amps, and for the ecm to get a clear and accurate
> voltage sense, can be difficult.
> Bruce
>
> From: "rr" <RRauscher at nni.com>
> Subject: Re: BatV
> > Have 1/0 from battery to starter, then 8awg from starter to J block.
> > Body is ground return. ECM picks up power from J block. Also
> > have heavy duty switch on gnd line, 1/4 volt lost right there.
> > BobR.
>
> > Bruce wrote:
> > > Me, Doc, and Sleepy all draw the line at 9.0V
> > > What ga. wiring ya using?.
> > > Bruce
>
> > > From: "rr" <rrauscher at nni.com>
> > > Subject: BatV
> > > > Have a good question: what is the minimum acceptable
> > > > battery voltage during crank? I put a DVM across the
> > > > battery terminals, pulled the fuel pump fuse and cranked
> > > > for ~10 seconds. Battery drops to ~10.7 volts and holds
> > > > during the cranking.
> > > > For a charged battery & good starter is this a bit low?
> > > > EFI content: The ECM will still fire the injectors and
> > > > the engine starts with this low of a battery voltage.
> > > > The ECM reports the BatV term to be at 9.0 volts during
> > > > crank. Lots of loss with the battery in the trunk!
> > > > BobR.
>
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