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Old 03-08-2018, 01:16 AM   #2
TomM96
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Join Date: May 2004
Location: Long Island, NY
Posts: 1,523
Default Re: 00 SL1 hazards/signals all OK until headlights on, then nothing!

undigested comment ~

The resistance of cold incandescent bulbs is very low, so when the flasher turns them on, the current is maximum.

When the filament heats up, the resistance rises significantly, dropping the current flow down a lot.

The LED bulbs never draw as much power as the hot incandescent... and Much less than the incandescent does at 'turn on' (initial inrush).

.... So , possibly the low power drawn by the LEDs is not sufficient to 'prime' the timing circuit (or, Heater) in the Hazard/flasher control unit.
I think sometimes LEDs work on brake circuits, but not signals.


That issue only arises when headlamps on , suggests maybe the headlamps are saturating the power available from a circuit common with the signals.

>>> there's nothing notably consistent in my comments... Sorry !

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