01-26-2020, 09:10 AM
Join Date: Aug 2014
Location: S. Georgia
The side marker light have no ground. The term "floating ground" means simply there is no ground. When the parking lights are off, and the turn signal is flashing, the side marker flashing light is in sync with the front turn signal (when the front is on, the side is on, when the front is off, the side is off).
When the lights are on, the side marker turn signal flashes the oposite of the front turn signal. (When the front turn signal is on, the side is off and when the front signal is off, the side is on).
This comes about by using the "other" wire in the side marker as a ground. Juse as when you have a bad ground on the rear light and you have the lights on and hit the brakes, the light goes off. The current flows in one wire of the side marker and out the other to seek a ground.
This works fine when the parking lights are on. Of if you are using the turn signals and the parking lights are off. But, when the parking lights are on and you are using the turn signals, for the moment that both systems are energized, you have +12v on both wires and current cannot flow so the side marker lights go dark. When the flasher opens the circuit, the side marker lights up.
1. With the flashers off, and the parking/head lights on, does the side marker light up?
2. Is the new bulb you have installed by chance an LED bulb?
The fact that the turn signal indicator on the dash stays on, indicates that the system thinks a bulb is out. With the exterior lights off, activate the turn signals on that side and check all three bulbs (tail, front fender and side marker). Do all three flash?
LED bulbs will not work with a floating ground. By their nature (being a diode) they will pass current in only one direction. So, without rewiring that light to put a full wave diode bridge in the circuit, either the side marker light will work or the turn signal will work, but not both.
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