Clean ALL grounds..... clean the positive side of the battery..... always first step. It seems like you are not getting enough power (flasher unit appears to be working.... but may not have enough power to flash.) Test your battery. Cure the simple things first. Then work up from there.
I have added a ground wire from the ground plate at each of the tail lights (where all the grounds come together and is bolted to the body) as aluminum is not a great conductor. Run a wire from there, down to the frame. Since you mentioned in another thread that the starter seems slow, make sure you do the 2 ground straps in the engine bay (one from the starter/engine, and one to the body.).
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Andrew Barr.
1972 Series III 109.
"the Tin Turtle"
"However, that was his ploy and I caved....totally caved...  LOL!" Jellijo
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