by sidspop » Wed Dec 10, 2008 7:57 pm
A small buzzer should be available from Maplin, maybe even a beeper.
Run two wires, one from each positive on left and right indicators, through diodes to the buzzer. Then earth on the negative.
Diodes are electrickery, and allow volts through only one way. Suitable diodes are 1N4001, about 10p each, or ask your local TV repair shop.
Hope this helps