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Old 12-02-2016, 04:28 PM   #6
Paul Bennett
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Join Date: Sep 2016
Posts: 628
Default Re: Turn signal indicator

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6v cars are different from 12v cars - and the OP didn't specify.

Diode polarity - current flows when ANODE, the triangle, is closest to the positive. And the CATHODE, or bar, is closest to the negative.

As the indicator light is connected to earth ground the diode connected to said light is considered the same as the battery polarity post which connects to the car frame or engine. I.e. the diode anode connects to indicator light on 6v cars and the diode cathode connects to indicator light on 12v cars.

And if you get it wrong, no damage, it simply won't work. ADDED - the diodes themselves mostly have only the cathode marked on them, as a ring or bar nearest the cathode end.

But what I would do first is use a TEST LIGHT and learn if one terminal of the flasher will light when indicating right AND left direcction, in which case, problem solved without any diodes. Connect the indicator light to that terminal. It all depends upon the indicator circuit used, which does vary.
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