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Joined: Dec 2021
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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]

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Learner Plates Off!
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WOW! Thanks for the lesson in electricity. Do AC and DC behave the same?

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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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Originally Posted by GParkins
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]


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
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What did I do in my Morgan today?

Nothing. Certainly not for the foreseeable future!



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2005 Plus 4
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Sorry to see that... hope you recover soon and can get back to enjoying things, incuding your Morgan.

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Salty Sea Dog
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Oh dear. I hope that doesn't take too long to recover!


Graham (G4FUJ)

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Ouch, get well soon.


JohnV6
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That looks painful. Hope it heals quickly.


Paul
Costock, UK
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Heal fast! People who think that laughter is the best medicine have never had morphine...

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