Only the second time I ever found this type of fault. My golf trolley stopped working on the golf course yesterday. No choice but to push it all the way back to my car in the car park. The problem was the copper wires inside the cable insulation corroded away and a short piece of "good" looking cable had to be replaced. Finding this fault took some time, fixing it was easy enough. I found a similar problem on a Honda 50 motorcycle over 40 years ago. On the Honda, the cable between the battery terminal and the inline fuse holder was corroded and open circuit as a result. An easy fix. One thing is that you can never take anything for granted when looking for a fault. A seemingly good cable can be the culprit. Good outcome in my case, the trolley got a reprieve from the bin and might give another season or two service.
Insanity: doing the same thing over and over again and expecting different results. [Albert Einstein]
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The problem was your electricity wasn't clean enough. Have you thought about investing in a Barry Noggins Premium Electricity Scrubbing Filter:
I was thinking that the sealed motor control box was blown. I first checked the speed control on the handle of the trolley. It looked OK. If the motor control box was blown, the trolley was destined for the recycling depot. The battery, a Lithium unit, is very expensive [€250 three years ago] so it could be used in a new trolley.
As I wrote in the first post above, I only encountered this type of fault once before. Keep it and the solution at the back of your mind, you might come across something similar in the years to come. And you will know what to do.
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I see this quite a lot with the speaker connections in old amps too - it's one of the main reasons crimp connectors are less reliable than soldered joints.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
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When people are talking about electroloysis in this context, I they mean galvanic corrosion due to ion migration. I think! They could be talking about hair removal!