7443 7444 7443 7441 7440 T20. 7440 992A 7440 (A refers to Amber) T20. Solve hyper flash or no blinking of turn signal;. Each LED bulb installation requires one resistor connected in parellel. When using LED bulbs for turn signal, you will need to use the above load resistor or decoder set to prevent hyper flash or bulb malfunction.