Hot electrical junction near steering column - normal?

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Aerial_stu
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Hot electrical junction near steering column - normal?

Hello, whilst trying yoga this afternoon, looking for loose bits to tighten to suppress some of the rattles I discovered this two pronged device with a green bridge that was getting very hot when the ignition was on.  (I had the ignition on to test my heated window connection).

Is it meant to get so hot so quickly?  Whats it for please|?

Thanks, and sorry the photo is upside down!

Stuart (Sigma 2016 SV)

 

Jonathan Kay
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It’s a resistor. And they get hot in normal operation. 

Jonathan

Aerial_stu
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Simple, thank you (again) Jonathan.

Regards,

Stuart

rj
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It could be a ballast resistor for the alternator warning lamp - in which case it should only get hot when the engine is not running.

What colours are the wires it connects to?

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Aerial_stu
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Hi RJ, the engine was off at the time so makes sense.  The coloured wires are just visible in the photo.

Regards,

Stuart

rj
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Hi Stuart

Tracers etc on the wires may be hidden. Hence my question. I'm unsure if it's a brown with a yellow tracer and a green with grey tracer. But yes, it makes sense - especially if the warning lamp is an LED.

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Jonathan Kay
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Jonathan

rj
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Could you also turn the wires, please? Then I can better see colours and tracers.

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aerobod
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Definitely looks like the 68 Ohm excitation resistor between the alternator warning light and alternator. The wires for that are brown/yellow and green. It is rated at 4W, so is designed to take the current and get quite warm.

James

John Vine
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What James says (#9).

I sent CC the same question 3-4 years ago, along with this photo:

 

They replied:

"The resistor in the picture is to prevent the alternator light on the tacho from coming on and yes it will get hot."

And from the Assembly Guide:

 

It gets hot when the ignition is switched on, but cools down again once the engine starts.

JV

ChrisC
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Isn't it speed sensor related, gets hot if the sensor stops in an on position (could be hot when off). Green and Yellow Black are also speed sensor colours. I believe it's used to convert the speedo to use a NPN or PNP sensor.