weird electrical thingy

[steve ravet]

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
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