MD7A temperature gage

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bfb
Posts: 25
Joined: Nov 24th, '19, 10:35

MD7A temperature gage

Post by bfb »

I bought my cd30c October 2019 . The temperature gauge just moves to the beginning of white area after running for two hours. I measured the OHMS on the sensor and I get a difference between when the engine is cold and hot but don’t know if it’s the right resistance . I hooked up a jumper between the sensor wire connection and ground and the gauge went all the way up. I believe it is wired correctly. I suspect it is a bad sensor. From what I read on existing forums the pointer should be in lower quarter of the gauge.
Any suggestions would be appreciated
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mgphl52
Posts: 1809
Joined: Feb 6th, '05, 14:15
Location: s/v KAYLA CD 28 #318
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Re: MD7A temperature gage

Post by mgphl52 »

Is it possible the sensor is an alarm unit instead of a temperature unit???
Try pulling the sensor and putting it in a pan of water on the stove with a meter connected to the leads.
Check the value as you bring the pot past a boil. If it suddenly maxes out, it's an alarm sensor.
For a relatively small price, you can buy an infrared thermometer to validate a "new temperature" sensor.
-michael & Toni CDSOA #789
s/v KAYLA CD28 #318
2012 FLSTC Heritage Classic
Niceville FL
+30° 30' 24.60", -86° 26' 32.10"
"Just because it worked, doesn't mean it works." -me
No shirt + No shorts = No problem!
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S/V Ethan Grey
Posts: 166
Joined: Apr 19th, '19, 06:52
Location: S/V Ethan Grey - CD 30C

Re: MD7A temperature gage

Post by S/V Ethan Grey »

I had an overheating issue with mine and wanted to know what temperatures corresponded with the gauge colors. Here is my data. This will vary based on sender and gauge, so I don't know if it will be of any help to you. Eventually I want to change the gauge to one that outputs actual temp versus the white, green, red indicators. At 109F, the gauge was just at white/green mark. At 168 the indicator is at the green/red mark.
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David
S/V Ethan Grey
1981 CD 30C, Hull #199
Niceville, FL
CDSOA# 1947
Keith
Posts: 576
Joined: Sep 14th, '12, 20:01
Location: Moon Dance 1979 CD 30C Hull # 134

Re: MD7A temperature gage

Post by Keith »

Mine is exactly like yours, the highest it ever gets is just into the white. I've been running it that way for 8 years with no problems.

Keith
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