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Ok, the job is done. I had to set my heat gun on "F--- You!" and just let it blast the aluminum housing for quite a while in order to dig out the rest of the potting and the dead circuit board. (I forgot to try the acetone trick). It is impossible to remove the potting from the circuit board...

Just an update on my own personal turn signal mod- One of my failed units is less than a year old. Using my DeWalt heat gun set at 700F, I have softened and removed the top layer of black potting goo...only to discover that underneath that, is a very hard layer of transparent potting goo. It...

Well, the OP already did but I guess I can too.

You're saying that the reason for frequent failure of this part is because the potting breaks the connections and that there's usually nothing wrong with the flasher itself? Well that's very interesting. I have two faulty units. They failed in different ways. I have a really wicked heat gun so...

@papakb In your very first post on this thread, how did you "gut" the military flasher? You dug that rubber square of potting out? How'd you break it free? I've ordered the Grote flasher and I'd like to replicate what you've done.