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What is the blue box of this Turn Signal Circuit? Solved

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t1d:
A friend wants me to build this and I have the parts. But, the schematic is not traditional and I can't tell what is going on, in the blue box. An explanation, please and thank you.



EDIT: The blue box is the relay. Solved.

Rerouter:
Its using an automotive relay, its using the capacitor to keep the relay closed for longer than the flash rate of the indicators,

30 is common,
87 is normally open contact
87a is normally closed contact

86 / 85 are the coil connections and dont care what polarity.

t1d:
Thank you!

glarsson:
The blue box has the same pinout as a automotive relay and the numbers (30, 85,...) are the standard numbers found on automotive relays, so perhaps the blue box is a relay with a diode in parallel with the coil? :-)

rbm:
The diode illustrated is in parallel with the relay coil and is a snubber circuit (reverse-polarity) to reduce spikes that could hurt the upstream flasher.

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