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The clock in question was part of the electric panel setup on late 80's Pearsons. I have one of these panels. The clock still runs but some segments of the LED display are not working. It's pretty small. The digits are about 1/2" tall. The clock has black, red and yellow wires that go like this:
Black = Ground
Red = 12V from battery (always connected to keep time)
Yellow = 12V after main battery switch to turn clock display on/off.
I hooked the clock up to my fancy Simpson bench meter and got .0003 amps with just the red power lead connected and an astounding 0.13 amps with the yellow display wire connected and the display on. That would work out to about 3AH per day if that display is left on. That will kill a group 31 battery in 30 days. With the display off (yellow disconnected) it is about 0.2AH per month? Probably less than the lead acid self discharge.
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well the first thing I do to begin my 3 month stay on the boat is to put my watch away. when I get up in the middle of the night I like to know what time it is, so that's why I need the clock.
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