weird electrical thingy

[Jeff Bromberger]

i unplugged the water pump from the AIR connector... then i measured from
the ground pin in the connector to the chassis ground... so there shouldn't
have been any current in that line, but there would be current flowing
through the common ground that it was connected to.. ??? i'm hoping that it
is some kind of incorrect reading like you are saying and that the wiring is
ok...

thanks,
jeff

----- Original Message -----
From: steve ravet <sravet at arm.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, April 06, 2001 9:51 AM
Subject: Re: weird electrical thingy


> You measured the resistance from the pump connector to chassis ground,
> while there's current flowing (pump on)?  You can't (I don't think)
> measure resistance in an active circuit.  When you pull the relay or
> otherwise interrupt the current and measure .5 ohms that's correct.  you
> could also probe the connector to the pump from the back while it's
> connected to see what voltage the pump is getting.
>
> --steve
>
> Jeff Bromberger wrote:
> >
> > Sorry if this isn't completely on topic... i installed an electric water
> > pump in my 94 z28... i am no longer using the A.I.R. pump so i wanted to
> > reuse it's relay/fuse/circuit... the PCM has to ground this relay to
turn it
> > on... i hard wired this line to ground so that it would always be on
when
> > there is ignition power. i then wired the original AIR connector to the
> > water pump. The problem that when the circuit is enabled, i'm seeing 23
ohms
> > between the AIR pump connector pin that is ground and an actual ground
on
> > the chassis... the stranger thing is that if i pull the fan relay out
(which
> > shuts off the fans) or turn off the ignition power this same test gives
me
> > 0.5 ohms... i'm concerned that my water pump, being low resistance,
won't
> > get enough voltage if it's in a circuit with higher resistances... does
any
> > of this make sense? is this normal? is this wire that i'm using for
ground
> > not really a ground? the helm manual shows it as such, but i've found
other
> > errors in there before....
>
> --
> Steve Ravet
> steve.ravet at arm.com
> ARM,Inc.
> www.arm.com
> --------------------------------------------------------------------------
--
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org