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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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02-08-2016, 06:15 PM | #1 |
Gone Wild
Join Date: Dec 2014
Location: Dallas, TX
Posts: 247
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Run/Tow switch heating up?
I noticed the thermal labels I used on my Run/Tow switch had some 'burns'. This has me a little concerned. It doesn't take much heat to turn the labels black. The switch has never felt warm. I don't see anything that could have caused an arc.
Any ideas how the burn got there? |
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02-08-2016, 11:59 PM | #2 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Run/Tow switch heating up?
Droplet of battery acid? Take a small piece of that label material and touch it to the bottom of one of your battery caps to see how the label reacts.
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02-09-2016, 08:56 AM | #3 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,187
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Re: Run/Tow switch heating up?
That has to be an acid burn. There is no significant current through that switch so it can't get hot.
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02-09-2016, 09:45 AM | #4 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Run/Tow switch heating up?
It depends of what the definition of is is.
Personally, I consider all the current that powers the electronics in the XCT controller, all the current that flows through external switches connected to the controller, the ITS current and the solenoid coil current as significant, but I agree heat from the Run/Tow switch didn't make the black spot the thermal tape. The tape is adhered to some fairly thick metal, which is very likely to be an excellent thermal conductor, so a catastrophic failure of some kind that was significant enough to get the switch hot, would blacken the thermal tape on both sides in a circular pattern radiating from the hole where the switch is physically attached to the solenoid mounting bracket. It is most likely caused by acid, but maybe not an actual drop of electrolyte. The air under the seat contains acidic vapors, so all that is needed is a drop of water of collect them. Also, the typical pH of human sweat is in the 4.6 to 5.5 range, so just a drop of sweat might have caused the thermal tape to discolor over time. |
02-09-2016, 09:50 AM | #5 |
Gone Wild
Join Date: Dec 2014
Location: Dallas, TX
Posts: 247
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I was checking the water level in all batteries when I noticed it. A drop could have flown out when I was popping the tops off. I will try a little science experiment tonight by placing a drop of battery fluid on a different piece of thermal tape.
No other symptoms....cart runs great! |
02-09-2016, 06:30 PM | #6 |
Gone Wild
Join Date: Dec 2014
Location: Dallas, TX
Posts: 247
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Test results:
No discoloration from battery fluid. |
02-10-2016, 02:45 PM | #7 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Run/Tow switch heating up?
Hmmm...
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02-11-2016, 10:09 AM | #8 |
Gone Wild
Join Date: Dec 2014
Location: Dallas, TX
Posts: 247
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After 24 hours, it has changed colors, but still looks different than the other label. I will replace the label on the cart and see if it happens again.
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