[C320-list] Electrical Engine Alarm problem

[crashley at gte.net]

Bruce,

Here's what I discovered on my boat which may or may not apply to your 
situation. My audible alarm was somewhat flakey in that sometimes it would 
sound when the igintion key was ON and sometimes it wouldn't. I opened the 
engine control pod and found that the alarm unit was one rated for 24 volts. 
I did a little research and found that there is a 12V version of the same 
unit (not sure why Catalina or their subcontractor installed a 24V version). 
The part number was Intervox BRP4535S-24-CD (the 24 indicates 24V unit) and 
I replaced it with an Intervox BRP4535S-12-CD (a 12V unit). The part spec 
sheet says that either one operates down to 4V but it would seem that the 
12V unit would be the correct chioice for a 12V system. I found the part at 
Allied Electronics for only $5.82 (this can't possibly be a 'boat part"!!) 
but by the time I ordered it online the shipping and handling made it about 
$20.00. (This is more like it!) Anyway, I installed it a couple of weeks ago 
and it works but I haven't really tested it out too many times.

I also learned an interesting fact that maybe everyone here already knows. 
The unit (either the 12V or 24V) has two inputs, when one is grounded it 
emits an continuous alarm (usually connected to water over temp switch) and 
when the other input is grounded it emits an intermittent alarm, (usually 
the oil under pressure alarm). There is 3rd input that is the switched 12V 
source.

CRA
Rosebud #882

Here's a link to Allied Electronics and the 12V version:

https://www.alliedelec.com/Search/ProductDetail.aspx?SKU=6230022&MPN=BRP4535S-12-CD&R=6230022&SEARCH=6230022&DESC=BRP4535S-12-CD

----- Original Message ----- 
From: "Bruce Stanley" <brucestanley36 at gmail.com>
To: "C320-List" <c320-list at catalina320.org>
Sent: Wednesday, September 24, 2008 11:36 PM
Subject: [C320-list] Electrical Engine Alarm problem


> Electrical Engine Alarm problem.
>
> Alarm works,
> but not properly...
> -----------------------------
> NO ALARM SOUND when Key is in ON position.
> NO ALARM SOUND when engine is running.
> -----------------------------
> ALARM SOUNDS if the Electrical LEAD to Engine is MOVED from DESIGNATED 
> Male
> connection on engine
>         TO any GROUND POINT ON THE engine, AND the Key is on.
> ALARM continues to SOUND if (AS ABOVE) and Engine is ON.
> ------------------------------
>
> obviously the Alarm works, but not as it should.
> -----------------------------
>
> any suggestions appreciated
>
> Bruce Stanley / C320 #1084/Sydney
>