Electrical Problem

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Robert Boxberger

I have an elctrical problem that is baffling me. I have 2 Raymarine instruments mounted above the companion way. One is the depth guage, the other the knot meter. Both instruments have seperate wires leading to the same fuse. (Breaker turned on, they are both on, breaker off,...) The problem - At commisioning after the winter lay up, only one instrument was working. When I unplugged the back of the one unit, the other instrument began working. When I plugged the previously working unit back in, the one unit still worked, but the one I just plugged in didn't. When I revered the process, only one unit would work. Any suggestions would be appreciated.
 
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Mark Fabre

Spring (electrics) Cleaning

Could be one of two problems: 1) Connector needs cleaning. 2) Grounding corroded. Grounding problems are the strangest. Sometimes things will work when they shouldn't and don't work when they should. Plugging in one device can cause a new indirect ground connection.
 
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Daniel Schafer

Voltage drop

Just my two cents, but it seems like it could be a voltage drop due to weak batteries, corrosion, wire issue, etc. Typical Raymarine insturments (ST 60, 40, etc.) can feed off, or piggyback off one another. With only one pulling volts, you could have enough to kick it on. However, there are not enough volts left to turn the other on. Wire corrosion, contact corrosion, or grounding issue may be the problem. If you have a volt meter, see if you can get the pin-outs and measure the voltage wiht no load, wiht one intsturment, and any drop with load of two instruments.
 
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