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Wales
by Joske Vermeule, September 1
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Forums39
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Posts838,124
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Most Online1,063
Jun 14th, 2026
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Joined: Dec 2021
Posts: 116 Likes: 2
L - Learner Plates On
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L - Learner Plates On
Joined: Dec 2021
Posts: 116 Likes: 2 |
A loose connection can also be described as "resistive." The same applies to a corroded or dirty connection. At the connection point, the increased resistance causes the temperature at the connection to increase. The load of the circuit (in Watts), whether it is a headlight, horn, or fan, remains the same, as does the voltage (14.2). Therefore, if the total circuit resistance goes up, the total circuit amperage decreases proportionally, failing to trip a magnetic breaker. That's why electric motors often have a thermal protection breaker built in. In a locked rotor condition, resistance skyrockets and the current goes down...but the load remains, so the heat increases, sometimes to the point of combustion. Furthermore, as the conductor heat increases, its resistance drops, exacerbating the problem. I've attached a photo of a resistive connection nearing the end state: ![[Linked Image]](https://tm-img.com/images/2022/09/17/IMG_0022.jpg)
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Joined: Jul 2022
Posts: 460 Likes: 80
Learner Plates Off!
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OP
Learner Plates Off!
Joined: Jul 2022
Posts: 460 Likes: 80 |
WOW! Thanks for the lesson in electricity. Do AC and DC behave the same?
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Joined: Jul 2019
Posts: 5,470 Likes: 476
Charter Member
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Charter Member
Joined: Jul 2019
Posts: 5,470 Likes: 476 |
In terms of loose dirty or corroded connections... Yes. In the image GP posted above, the bad connection creates extra resistance in the circuit and can act like the element in an electric fire.
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Joined: Jul 2007
Posts: 27,846 Likes: 764
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,846 Likes: 764 |
A loose connection can also be described as "resistive." The same applies to a corroded or dirty connection. At the connection point, the increased resistance causes the temperature at the connection to increase. The load of the circuit (in Watts), whether it is a headlight, horn, or fan, remains the same, as does the voltage (14.2). Therefore, if the total circuit resistance goes up, the total circuit amperage decreases proportionally, failing to trip a magnetic breaker. That's why electric motors often have a thermal protection breaker built in. In a locked rotor condition, resistance skyrockets and the current goes down...but the load remains, so the heat increases, sometimes to the point of combustion. Furthermore, as the conductor heat increases, its resistance drops, exacerbating the problem. I've attached a photo of a resistive connection nearing the end state: Which is why you do thermal testing on control panels in factories. Very scary to see that nut red hot.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Feb 2021
Posts: 185 Likes: 2
L - Learner Plates On
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L - Learner Plates On
Joined: Feb 2021
Posts: 185 Likes: 2 |
What did I do in my Morgan today? Nothing. Certainly not for the foreseeable future! ![[Linked Image]](https://www.tm-img.com/images/2022/09/17/BDA24634-2BD4-40B5-8F84-231CA37E7DC0.th.jpg)
2005 Plus 4
2020 Hyundai eKona
2020 Mitsubishi Outlander PHEV
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Joined: Jul 2019
Posts: 5,470 Likes: 476
Charter Member
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Charter Member
Joined: Jul 2019
Posts: 5,470 Likes: 476 |
Sorry to see that... hope you recover soon and can get back to enjoying things, incuding your Morgan.
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Joined: Jul 2007
Posts: 28,911 Likes: 354
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,911 Likes: 354 |
Oh dear. I hope that doesn't take too long to recover!
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW
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Joined: Jul 2007
Posts: 27,846 Likes: 764
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,846 Likes: 764 |
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Aug 2010
Posts: 5,469 Likes: 172
Charter Member
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Charter Member
Joined: Aug 2010
Posts: 5,469 Likes: 172 |
That looks painful. Hope it heals quickly.
Paul
Costock, UK
Plus Four 75th - Furka Rouge - Pip
Disco 5
Teddy - 17h1 Irish Draught cross
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Joined: Jul 2022
Posts: 460 Likes: 80
Learner Plates Off!
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OP
Learner Plates Off!
Joined: Jul 2022
Posts: 460 Likes: 80 |
Heal fast! People who think that laughter is the best medicine have never had morphine...
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