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Old 11-23-2020, 02:58 AM
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Gadgeteer Gadgeteer is offline
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Default Those dang spades

SWMBO came to the kitchen, complaining that her bedroom was 69º, although the thermostat was calling for 72º. I checked the thermostat, and sure enough, it said hall was 70º.

Since spade connectors had failed to conduct on prior fails, I shut off the power to the furnace's blower motor, and started to tweak the connections. All seemed good, since my last adventure with them a year ago. The last two spades were on the temperature limit switch, and as I tweaked one, it fell off. On closer inspection it appeared to have been barely on for some time, due to the burned appearance of insulation next to the crimp. I grabbed the female spade with a needle nosed plier with insulated handle, and pushed it back onto the male. Turned power back on, got flame, and a minute later, the motor came on.

So, after decades of dependable function the female spade decided to separate from the male (sound familiar?). Obviously, the connection needed a strain relief to prevent the pull from the wire working in conjunction with motor/blower vibration to separate the connection. Usually, it is galvanic corrosion that interferes with current flow between connectors, but this was a new one for me.

Last edited by Gadgeteer; 11-23-2020 at 03:42 AM.
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Old 11-23-2020, 03:40 AM
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Old 11-29-2020, 07:20 PM
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This story reminds me of all the fuse block work I did in my house garage
at home on Dodge trucks and cars 70's thru 80's.

Easy fixes but annoying as heck to trouble shoot. lol
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Old 11-30-2020, 01:57 AM
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After I sent the photo of the temperature limit switch to my engineer son he was more concerned with the lack of identification of which unit of temperature was denoted on the switch face. Was it fahrenheit or centigrade? He said he tells his students to, always, make sure to denote the correct unit in use, and mentioned the loss of a Mars probe, due to failure to communicate.

https://spacemath.gsfc.nasa.gov/weekly/6Page53.pdf
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Old 11-30-2020, 07:07 PM
slip knot slip knot is offline
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I work on the smaller Onan generators as a hobby and probably 1/2 of the electrical problems I see are loose spade terminals.
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Old 12-01-2020, 12:35 AM
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Quote:
Originally Posted by slip knot View Post
I work on the smaller Onan generators as a hobby and probably 1/2 of the electrical problems I see are loose spade terminals.
I've posted before that I fixed my microwave oven by tightening the spade connectors, and by re-crimping the spades to the wires. This procedure has kept the oven working trouble-free for many years, since the fix.
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Old 12-06-2020, 12:24 AM
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Quote:
Originally Posted by Gadgeteer View Post
I've posted before that I fixed my microwave oven by tightening the spade connectors, and by re-crimping the spades to the wires. This procedure has kept the oven working trouble-free for many years, since the fix.
I was involved in the re-building/restoration of a 72' aluminum power yacht. In the galley, the carpenters had skillfully built custom cabinetry and a box around a mid-sized microwave bought new, but now out of warranty because of the time taken for the re-fit. Of course, it decided to stop working or maybe never worked. As the problem-solver on the crew, I took it apart and found a detached spade going to I think a sensor, reattached it and the microwave now worked! It may have been detached from the factory or maybe from rough handling on the boat.
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