Yesterday I was in the service truck stopped, making a left hand turn and I heard the backup alarm come on.
Turns out, it would come on whenever the brake pedal was depressed "and" the left turn signal was on. I noticed the marker lights were slightly pulsing opposite of the signal lights. I've heard it's caused by a "bad ground". It's easy to imagine a corroded or loose connection but how and what is being shared through ground? How are these four circuits being energized? I don't really even know how to ask the right question.
Wiggled all the rear light connections- problem solved.
Turns out, it would come on whenever the brake pedal was depressed "and" the left turn signal was on. I noticed the marker lights were slightly pulsing opposite of the signal lights. I've heard it's caused by a "bad ground". It's easy to imagine a corroded or loose connection but how and what is being shared through ground? How are these four circuits being energized? I don't really even know how to ask the right question.
Wiggled all the rear light connections- problem solved.
Just what is a "bad ground"
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