Motorcycle turn signals

I am looking for something like a pulse on, pulse off timer relay of about 20 to 30

turn signals on a trike. I am using HD handlebar controls which have a

Maybe look into the Versitimer 3 from Peripheral Electonics. The VT3 converts a pulsed input to an adjustable (1 to 60 second ) output. Input may be positive or negative. Negative output with LED to indicate timing cycle in progress. The VT2 also features a brake lead to cancel timing cycle. Features Leading and Trailing edge input triggers. It cannot handle the 20-30 Amps you need but the signal out of it could be wired to a relay.

Jim