If I were to change to a solid state turn signal unit ,where would I find info on how to wire the new solid state unit into the old system?

My turn signal controller box had filled up with water somehow and now I need to replace this unit . I would like to replace it with the original controller this is the one located by the heater box under the dash. has three relays in it and a flasher unit as well. If any one has an old used one the...