What´s the purpose of a reserve lighting unit?

Yamaha XS 850 discussion forum:


What´s the purpose of a reserve lighting unit?

What´s the purpose of a reserve lighting unit? 
Keith Markle said 2016-03-29 22:17 
 
I hooked a volt gauge in line with my headlight. Now my headlight wiring is dead and the gauge doesn´t work. Did I short out this reserve unit? 
 
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