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Old 01-05-2021, 04:26 PM
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Join Date: Aug 2005
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Bulb Out Monitor Questions W124

Electrical gurus, here's a question for ya that I could not find a straight answer to in the forum thus far.

Does the bulb outage monitor check for lower than defined spec voltage only, or can it be set off due to more than expected voltage?

The issue at hand, on my 300TD, I changed the third brake light to and LED unit, and also used the (US) unused fog lamp locations in the tail light to add secondary set of brake bulbs wired in series to the existing bulbs. I now have a total of 4x brake bulbs plus the LED 3rd brake light. If anything, I know I dropped a little wattage with going LED, but thought that by adding the extra brake bulbs, the brake circuit should be drawing more wattage now than before the mods. Would this extra wattage set off the bulb outage monitor?

I could not find a clear answer to this, and not much was indicated as this being an issue in their brake light upgrades which many have done. Is there a different wiring approach that I should take?

Edit: I know it is in the brake circuit as the indicator turns only only when activating the bakes initially. Have been on, with or without the LED 3rd brake light connected, so it comes down to the extra brake bulbs added to the tail lamps


Any advice, guidance is appreciated.
Thanks
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