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Strange knob under dash (left)

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Hi all!

I removed my dash last week and want to undo all alterations done to the cable loom. I found one button under the dash that seems strange to me. It is on the left, neer the rear window defogger switch and the hood release. It is a pull knob and it provides power to the R terminal from the alternator. It was in the "on" position when I tried the car. The button itself is powered by the ignition switch. 

Why this knob? The power to the "R" terminal is only there with the engine running so the knob does not add functionality?

BTW: I do not know what the "R" connection on the alternator does but I presume it need energised for charging the battery...

Edited by Kodjo
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