Motorcycle Repair: kawasaki 90mc1-a 1974, wiring loom, lighting circuit

Question
when the tail light is on and the indicators are on the tailight flashes aswell and when i apply the brake it causes the indicators to blink very slowly and are dim could you please help

Answer
I believe the connection to ground is bad on the lighting circuit.  Check all the connections from the battery to ground, make sure the ground points don't have paint on them, and that the grounds on the wiring loom all are tight and clean.  Good luck,  Jan