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Old 20-02-2018, 01:13   #16
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Re: How to add engine alarms

I fitted one of these a few years ago to my Volvo exhaust.. Wet Exhaust Temperature Alarm by Borel Manufacturing Inc.

Fitted the alarm just inside the companionway so can be heard in and out.
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Old 20-02-2018, 02:56   #17
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Re: How to add engine alarms

Thanks for all the info guys. I think I may have already found the solution. While I was outside looking at my new/old engine, I went through a box of goodies that was included. Lo and behold there is an extra control panel that apparently did indeed come with some versions of the MD7A. It has an "alarm block" wired in (per the manuals, as stated by a previous poster) that is connected to a buzzer and has indicator lights for oil, temp, and amp. Eureka !

Its a slightly different size than my current panel but that is easy enough to deal with. And with the wiring diagrams I have I should be able to get it hooked up properly. So we may be good to go !

One I noticed first off is there is a one wire connection coming off the panel for the oil pressure, but the connection on the engine has two terminals. I'm assuming one is ground, but which one ? Does it matter ?
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Old 20-02-2018, 04:40   #18
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Re: How to add engine alarms

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Originally Posted by S/V Alchemy View Post
Yep, also known as "exhaust gas temperature" (EGT) monitor or "pyrometer". Trucks use them, too. Other good alarms to have are related, like one that tells you if the water circuit is failed or failing, which relies on a flow measurement.
Not the same thing! Exhaust SYSTEM temp and exhaust GAS temp are completely different issues. You can be burning down your exhaust system due to lack of water injection and still have perfectly normal EGT as measured at the manifold.
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Old 20-02-2018, 04:41   #19
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Re: How to add engine alarms

Alarming thread.
Now In need to check if my temp alarm measures coolant or exhaust.
Thank you
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Old 20-02-2018, 07:30   #20
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Re: How to add engine alarms

[One I noticed first off is there is a one wire connection coming off the panel for the oil pressure, but the connection on the engine has two terminals. I'm assuming one is ground, but which one ? Does it matter ?[/QUOTE]

Yes, it matters. The second terminal is for the alarm. The sensor switches to ground through the body when low pressure. Ditto with the temp sensor if it is the combo sensor. You can tell which is which with a VOM/multimeter. One terminal has a larger lug.
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Old 20-02-2018, 08:00   #21
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Re: How to add engine alarms

I have been very pleased with the engine temperature and bilge water alarms I got from www. borelmfg.com. They were pretty easy to install and look nice. As far as I can tell, they work well, too.
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Old 20-02-2018, 11:13   #22
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Re: How to add engine alarms

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Originally Posted by jamhass View Post
[One I noticed first off is there is a one wire connection coming off the panel for the oil pressure, but the connection on the engine has two terminals. I'm assuming one is ground, but which one ? Does it matter ?
Yes, it matters. The second terminal is for the alarm. The sensor switches to ground through the body when low pressure. Ditto with the temp sensor if it is the combo sensor. You can tell which is which with a VOM/multimeter. One terminal has a larger lug.[/QUOTE]

Awesome thanks ! I'll go take a closer look.
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Old 02-04-2018, 14:51   #23
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Re: How to add engine alarms

Iím giving some thought to using this multiple input voice annunciator: https://www.elkproducts.com/product-...e-voice-module
It would solve the problem of figuring out what is alarming.
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