I have a '94 Chaparral with a Mercruiser 5.7L engine. I recently ran into a
problem when I put my boat in the water, the "Pressure Switch" (partnumber
87-805605A1 http://www.mercruiserparts.com/images/mer/2689.jpg (in picture
what is the nut and washer for? the wire just pushes on) rotted and oil was
spurting out. After replacing the Pressure Switch (oil replaced and
pressure back to normal), WITHOUT having the engine on and when turing the
key one click I get a continous audio warning, the only way to stop it is
remove the wire from the Pressure Switch. When the engine is running the
oil pressure is normal (see additional question below) and the alarm doesn't
sound, it only sounds when the engine is off and the key is turned one click
to turn on the accessories. Any suggestions??

I have straigh 40 weight oil, when running at a decent cruising speed my oil
pressure is around 60-65 is that normal or should it be a little lower?

Thanks for any info and help.

-Matt

On Wed, 25 Aug 2004 17:09:49 -0400, "Matt"
wrote:

I have a '94 Chaparral with a Mercruiser 5.7L engine. I recently ran into a
problem when I put my boat in the water, the "Pressure Switch" (partnumber
87-805605A1 http://www.mercruiserparts.com/images/mer/2689.jpg (in picture
what is the nut and washer for? the wire just pushes on) rotted and oil was
spurting out. After replacing the Pressure Switch (oil replaced and
pressure back to normal), WITHOUT having the engine on and when turing the
key one click I get a continous audio warning, the only way to stop it is
remove the wire from the Pressure Switch. When the engine is running the
oil pressure is normal (see additional question below) and the alarm doesn't
sound, it only sounds when the engine is off and the key is turned one click
to turn on the accessories. Any suggestions??

That sounds normal to me - with the engine stopped, you have no oil
pressure, so, when you turn the key on the "low oil pressure" alarm
will sound, and will continue to sound for a few seconds after the
engine starts, until the oil pressure builds up.







--
Peter Bennett VE7CEI
email: peterbb4 (at) interchange.ubc.ca
GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html
Newsgroup new user info: http://vancouver-webpages.com/nnq

But it never did that before... And having it like that i can't have the
depth finder or any accessories on w/o theengine on. (only the radio will
work w/o the key in the ignition).


"Peter Bennett" wrote in message
...
On Wed, 25 Aug 2004 17:09:49 -0400, "Matt"
wrote:

I have a '94 Chaparral with a Mercruiser 5.7L engine. I recently ran
into a
problem when I put my boat in the water, the "Pressure Switch"
(partnumber
87-805605A1 http://www.mercruiserparts.com/images/mer/2689.jpg (in
picture
what is the nut and washer for? the wire just pushes on) rotted and oil
was
spurting out. After replacing the Pressure Switch (oil replaced and
pressure back to normal), WITHOUT having the engine on and when turing
the
key one click I get a continous audio warning, the only way to stop it is
remove the wire from the Pressure Switch. When the engine is running the
oil pressure is normal (see additional question below) and the alarm
doesn't
sound, it only sounds when the engine is off and the key is turned one
click
to turn on the accessories. Any suggestions??

That sounds normal to me - with the engine stopped, you have no oil
pressure, so, when you turn the key on the "low oil pressure" alarm
will sound, and will continue to sound for a few seconds after the
engine starts, until the oil pressure builds up.







--
Peter Bennett VE7CEI
email: peterbb4 (at) interchange.ubc.ca
GPS and NMEA info and programs:
http://vancouver-webpages.com/peter/index.html
Newsgroup new user info: http://vancouver-webpages.com/nnq

Matt wrote:

But it never did that before... And having it like that i can't have the
depth finder or any accessories on w/o theengine on. (only the radio will
work w/o the key in the ignition).

If the alarm did not sound with the ignition on and engine stopped, you
would never know if the alarm was working or not. Hearing it is a test
of the alarm circuit.

It is arguably a bad idea to have to leave the ignition on (with the
engine not running) to use accessories. In some cases it can be hard on
some things like electronic ignitions.

If you had a starter switch with an accessory position, you could use
that and wire the stuff like radios and sounders on the accessory
position. Not having that, it sort of looks like your choices would to
either put a switch in the alarm circuit to silence the alarm (not
really a good idea) or upgrade yourself to a starter switch with an
accessory position.

Jack

--
Jack Erbes in Ellsworth, Maine, USA - jacker at midmaine dot com

This is perfectly normal-- as noted, you have no oil pressure until
you start the engine. I suspect your old pressure sensor was bad /
miswired, and that is why you never experienced this before. If you
need to use your sounder or accessories without the engine on, I
suggest you have them rewired-- in fact, it is surprising that they
would be wired to only come on with the key switch.


"Matt" wrote in message ...
But it never did that before... And having it like that i can't have the
depth finder or any accessories on w/o theengine on. (only the radio will
work w/o the key in the ignition).


"Peter Bennett" wrote in message
...
On Wed, 25 Aug 2004 17:09:49 -0400, "Matt"
wrote:

I have a '94 Chaparral with a Mercruiser 5.7L engine. I recently ran
into a
problem when I put my boat in the water, the "Pressure Switch"
(partnumber
87-805605A1 http://www.mercruiserparts.com/images/mer/2689.jpg (in
picture
what is the nut and washer for? the wire just pushes on) rotted and oil
was
spurting out. After replacing the Pressure Switch (oil replaced and
pressure back to normal), WITHOUT having the engine on and when turing
the
key one click I get a continous audio warning, the only way to stop it is
remove the wire from the Pressure Switch. When the engine is running the
oil pressure is normal (see additional question below) and the alarm
doesn't
sound, it only sounds when the engine is off and the key is turned one
click
to turn on the accessories. Any suggestions??

That sounds normal to me - with the engine stopped, you have no oil
pressure, so, when you turn the key on the "low oil pressure" alarm
will sound, and will continue to sound for a few seconds after the
engine starts, until the oil pressure builds up.







--
Peter Bennett VE7CEI
email: peterbb4 (at) interchange.ubc.ca
GPS and NMEA info and programs:
http://vancouver-webpages.com/peter/index.html
Newsgroup new user info: http://vancouver-webpages.com/nnq

But it never did that before... And having it like that i can't have the
depth finder or any accessories on w/o theengine on. (only the radio will
work w/o the key in the ignition).

Mine also sounds when the key is turned to the first position, I think to
let you know that it is working. Maybe yours never worked until you
replaced it?
You have a couple of options. If available, install an ignition switch that
has an "accessory" position like some cars have, which allows you to play
the radio without the ign on. Another option would be to wire an accessory
switch on the dash. That's what my boat has, and I have to remember to turn
it off when I finish using the boat. If all your accessories have their
own power switch, then you can just wire them to the same place as the
radio, and then turn them all off later to prevent running the battery
down.

Thank you for your help... I never struck me that my old switch never
worked.. I can run the radio w/o the key in the ignition i was just mainly
concerned about the alarm.

Thanks again guys!


"Floyd in Tampa" wrote in message
news
But it never did that before... And having it like that i can't have the
depth finder or any accessories on w/o theengine on. (only the radio
will
work w/o the key in the ignition).

Mine also sounds when the key is turned to the first position, I think to
let you know that it is working. Maybe yours never worked until you
replaced it?
You have a couple of options. If available, install an ignition switch
that
has an "accessory" position like some cars have, which allows you to play
the radio without the ign on. Another option would be to wire an
accessory
switch on the dash. That's what my boat has, and I have to remember to
turn
it off when I finish using the boat. If all your accessories have their
own power switch, then you can just wire them to the same place as the
radio, and then turn them all off later to prevent running the battery
down.