DIY: Sidemarker Wiring

[danomatic93]

Background info: Our corner lamps are dual filament bulbs which have 3 wires: Red +12V parking lamp Green +12V blinker Black 0V ground (colors may vary, check your manual or use a multimeter) The sidemarker has a single filament, which has 2 wires: Red +12V Black 0v ground How do you want it to be wired? There are 3 options... Option 1: -Sidemarker is illuminated (providing your parking lamps are on) -Otherwise, sidemarker is off (it will not blink) Option 2:: -Sidemarker and blinker blink in phase (at the same time) -Otherwise, sidemarker is off Option 3: -Sidemarker and blinker blink out of phase (alternate illumination) -Otherwise, sidemarker is illuminated (providing your parking lamps are on) How do you wire them up? Option1- Connect Red to Red. Connect Black to Black. Option2- Connect Green to Red. Connect Black to Black. Option3- Connect Red to Red. Connect Green to Black. The reason/how option 3 works… When the parking lights are on, +12V is on the positive side of the sidemarker and the blinker, being off, sends no voltage (0V) to the negative side. This +12V illuminates the bulb. Now, when the blinker is activated, +12V pulses are observed on the negative side. This means that there is +12V on BOTH sides of the bulb, which because of the lack of voltage difference, the bulb turns off. This is also why the blinker and sidemarker alternate illumination.

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[zerojett]

do you mean that the side marker can stay illuminated, but blink with the signal lights?

[danomatic93]

Originally Posted by zerojett

do you mean that the side marker can stay illuminated, but blink with the signal lights?

Correct, option 3 allows this.