72 K10 Signal Lights stopped working after LED conversion

[josuito]

I have a 1972 K10 long bed, the tail light and L&R signal were working well except for the left front signal light that it was connected to ground, why? I don't know, I bought like that, I already disconnected the positive signal wire from the ground but still not working (any help too will be appreciated).

Now, I installed this aftermarket LED tail lights and the L&R signal light are not working so I got this LED flasher that connects to ground, but still not working if I do the signal sequence manually from the column stick it works.

I'm about to rewire the whole truck but it's my daily driver truck, any help on this too it will be appreciated.

Thanks in advance.