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Catalina 34

General Activities => Main Message Board => Topic started by: KWKloeber on May 15, 2018, 05:08:20 PM

Title: Just clearing my brain about the high-temp alarm
Post by: KWKloeber on May 15, 2018, 05:08:20 PM
Am I correct, on panels that have the circuit board that trips the hi-temp alarm, the circuit board can be checked by shorting the temp sender lead to ground?

The hi-temp alarm obviously doesn't sound at key-on (it's low temp), but shorting the sender should simulate a hi-temp condition (> 200 F, low resistance in the sender) and sound the overheat alarm?

Seems correct anyway?  Can anyone verify that?

cheers
-k
Title: Re: Just clearing my brain about the high-temp alarm
Post by: KWKloeber on May 16, 2018, 03:11:29 PM
Along the lines of clearing my brain, do any of y'all happen to know the close approximate measurement of the depth of the m-25 or XP oil pan?

-k
Title: Re: Just clearing my brain about the high-temp alarm
Post by: KWKloeber on May 16, 2018, 06:41:19 PM
Quote from: KWKloeber on May 16, 2018, 03:11:29 PM
Along the lines of clearing my brain, do any of y'all happen to know the close approximate measurement of the depth of the m-25 or XP oil pan?

-k

Got it.  ~9.7 cm, fo' anyone who cares.  :thumb:

(Tnx whomever's photo that was.)

Title: Re: Just clearing my brain about the high-temp alarm
Post by: Dave Spencer on May 17, 2018, 11:22:04 AM
Ken,
I just arrived at my boat and checked the overtemp alarm condition you mentioned above. I can confirm on my M35A that shorting the sensor wire generates a high temp alarm. (On my boat, the light goes on. My audible alarm isn't functioning so I only got the high temp light showing.)  I trust this answers your question.
Title: Re: Just clearing my brain about the high-temp alarm
Post by: KWKloeber on May 17, 2018, 11:38:16 AM
Perfect Dave!
Just what I needed for someone else to troubleshoot their "high?" temp condition. 
I think the sender or board is bad, not the engine too hot.

I take it that you have the "temp" circuit board behind the panel, and either the circuit that fires the buzzer is fried, or the buzzer itself is fried.

ken
Title: Re: Just clearing my brain about the high-temp alarm
Post by: Ron Hill on May 17, 2018, 02:47:06 PM
Ken : I can confirm that the ground to sender will set off the PC Hi temp board alarm on my M25 XP and M25XPB engines.

In fact I wired in a momentary toggle switch on the engine pannel that way so I had a "Press to test" switch for my Hi Temp Alarm!!

A few thoughts
Title: Re: Just clearing my brain about the high-temp alarm
Post by: KWKloeber on May 17, 2018, 03:14:19 PM
Thanks Ron.

Cool I'dea with the momentary switch.

The XPB uses a switch, instead of the gauge sender like the circuit board on the M-25/XP, so that doesn't factor into my wonderment posted below.  As I know that you know, the alarm is a completely different set up on the B, than it was on the original Seaward temp alarm.

-k
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