I bought an old bus and didn't hear the turn signals. I put this in the turn signal circuit and added a little pop to the buzzer as it was too loud. Now I know when the turn signals are on. I found a YouTube video showing how to make a cheap "I have the lights on" buzzer. If you connect the hot wire to the headlights and ground to a circuit that only turns on when the ignition is on (becomes ground when the ignition is off, completing the circuit). This saved my battery a few times and now I know when my turn signal is on. I'm not sure what they meant by thickness. The wires are very thin but thick enough to work well so I gave it 5 stars for that.
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