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[quote=”EricTheCarGuy” post=60625][quote=”mckrishes” post=60379]Why did you replace the resistor?[/quote]
I never replaced the resistor.[/quote]
I was wondering. In the video around 31:07 you had said new resistor so I thought you had replaced it.
This is kind of like the recent Boeing 787 Dreamliner battery issue. We will never know the “root cause” (OOppss … who uses terms like “root cause” ?) of either of these problems.
While the conjecture that a bearing going bad causing excessive current is reasonable, I also do not find it reasonable that the switch should partially fail before the fuse. I also know from a “prior life” that oilite bearings usually make a lot of noise as they die. My gut says it was a bad switch or perhaps a switch that failed even when it was operating within the system specifications.
The real question is, so one everyone (who gives a sh!t and you do) wants to get better at what they do for a living, what would you do differently next time ?
I believe the bad ground you found at the beginning caused the problems. Extra resistance there means more current flow through the switch causing it to burn up. The high speed side is the only one affected because it grounds separately from the resistor.
Back probe the ground side of the connector with the fan on high. Any reading over 0 volts means resistance in the ground path. A jumper wire directly to ground will give you a quick test of your motor.
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