Re: oil pressure sender resistance?

["Daegrigg (Don)" <daegrigg@domain.elided>]

Bill,

The subject car is a Milano, Yes?  This info is for the 164 which may be of
help.  The wires to the oil level sensor of Grey-red and black (ground).
The oil level sensor does operate with the opening of the bi-metal strip.
This operates the idiot light on the instrument console - square light with
dip stick graphic.

The pressure signal comes from a separate sensor.  The red circle light at
the left edge of the pressure guage is the no pressure "idiot-panic light" .

At any rate - grey-red and black.

Don

----- Original Message -----
From: "Bain, Bill" <Bill.Bain@domain.elided>
To: "'sherwood white'" <vze2skmv@domain.elided>; "Ferdinando Di Matteo"
<aroctech@domain.elided>
Cc: <alfa-digest@domain.elided>
Sent: Thursday, December 12, 2002 10:20 AM
Subject: RE: oil pressure sender resistance?


> OK guys, this thing has gotten all twisted:
>
> My understanding is that the V6 engine has 2 sensors related to oil
> pressure:  the sender that provides a signal for the oil pressure GAUGE
> and one that provides a signal for the oil pressure (really oil
> presence) idiot light.  I'm told that the idiot light sender consists of
> a heating coil and a bimetallic strip.  Upon starting the car, the coil
> will heat up and if there is oil in the system, the oil will keep the
> bimetallic strip from heating up and breaking contact.  The infinite
> resistance that ensues due to the movement of the bimetallic strip and
> the broken contact will be interpreted by the ARC as "no oil" and
> trigger the idiot light.  My understanding is that the oil pressure
> gauge sensor circuitry and the oil pressure idiot light circuitry are
> not related, but let me know if I have misunderstood how the system
> works.
>
> Apparently the sender for the idiot light has a tendency to leak and the
> previous owner simply removed it and plugged the hole.  Removing the
> head to replace the idiot light sender is not an option at this point --
> I'd be nuts to take the car off the road to remove the head to fix an
> idiot light that's not needed anyway since the gauge works.  The oil
> pressure gauge works and all I want to do is stop the stupid idiot light
> since there's no sender for it to read from.  My understanding, which
> may be wrong, is that since the idiot light sender conducts some current
> when there's oil in the system, replacing the idiot light sender with a
> resistor seemed like an appropriate fix.
>
> Unfortunately, since there's no idiot light sender, I don't know which
> wires went to the idiot light and there are several wires that are
> unplugged behind the engine to "choose" from.  Can anyone tell me what
> the color(s) of the wires are that connect to the idiot light sender?
>
> Bill Bain
> AROC Atlanta
> '83 Spider
> '87 Milano
>
> -----Original Message-----
> From: sherwood white [ mailto:vze2skmv@domain.elided
> <mailto:vze2skmv@domain.elided> ]
> Sent: Wednesday, December 11, 2002 9:30 PM
> To: Ferdinando Di Matteo
> Cc: Bain, Bill; alfa-digest@domain.elided
> Subject: Re: oil pressure sender resistance?
>
>
> if you would like your oil pressure gauge to read anywhere near right
> with the motor off you should get about 220 ohms from the connector to
> ground it is a resistor and the resistance matters Ferdinando Di Matteo
> wrote:
>
> > For Bill Bain and other ill advised Alfisti, the oil pressure ender is
>
> > a variable  pressure diaphram , not tem activated   resistor.
> > Replacing with a fixd resisor of any value IS STUPID! If you don't
> > know for sure, lease don not offer bad advice.  Fred Di Matte
> > --
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