Maybe there is a cheap possibility to build a four way flasher. The flashing signal is going to the turn signal switch. The switch is only leading the signal to the right or the left side. If you install a switch which leads this signal to both directions, it will do. The only scrupulosity I have, is wether the relay is strong enough for all 4 lights. Next year I�ll test it.
Greetings merry X-mas Helmuth
