In fact i observed it in my older bike too. This is more common in almost all items related to electrical load. When additional load is added to the circuit there will be voltage drop from the source as it has to provide power to the new load too.
You only have to worry if the dimming of the console lights are more when a new load(say horn, head light or indicator) is used. Then you may have to check your battery/alternator, the wiring harness(but usually it will last much longer unless its tampered with) or the actual load itself.
Ram





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