7140 we acquired last year has been in the family 25 years, led front and rear flashers resulting from a hailstorm insurance repair. I’m sure they never worked, and I am stumped trying to get them working. Nothing would happen with hazard switch, turn signal either way would light three but no flashing. Fuse is good, so far I have replaced both the flasher and light switch and wired in a resistor at each of the four lights, and cleaned the ground cable under the right front cab, now hazard switch is still dead, turn signal either way flashes the left rear, left front is steady, I’m out of ideas, don’t see any wiring hacked up anywhere, any help will greatly appreciated