Turn signal goes out at "high" load

RedFish said

At a stop or idling in gear and very low rpm, the system voltage can fall below 12 volts. This causes headlights to dim, blower and/or wipers to slow, and even turn signals could slow to a stop.
If none of the other symptoms exist, replace the signal flasher.

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No other part is affected (blower, headlights, wipers all run as they always do). Hmm, will go flasher hunting in this case. :)

@68gtxman: I don't know if the voltage regulator has been upgraded by the previous owner(s). As I'm quite new to this, how would I indentify it? Oh and thanks for the welcome! ;)

Cheers!