[mikeceli]

As title says, I had cheap incandescent lamps, mounted under the rear bumper, on my 2000 Excursion 4x4 limited 7.3, for approx. 18 years. I replaced them with these

EXZEIT Waterproof LED Pods, 54W 3800LMS 180° Flood Offroad Light with CREE Led Chips, Off Road Lights, Led Work Lights for Truck Tractor Jeep ATV UTV Golf cart Boat, 12v/24v (3.5 inch) : Everything Else

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LED lamps, mounted in the exact same location. The much brighter LED units activate the backup sensor audible tone, every time I go in reverse. Even when I aimed them at the road. I unplugged the lamps and the reverse system operates correctly. Any idea why ? I asked Amazon tech support about it and they know nothing. Thanks.

 

[Big Horn]

It sounds like you may be having problems with backfeed from changing over to LED’s. You may need to wire diodes into the 12V+ to the new lights.

 

[mikeceli]

Thanks. I was thinking RFI (Radio Frequency Interference) , but I do not know if LEDs emit RFI.

 

[Steve83]

They don't, unless the voltage regulator is built REALLY badly. Temporarily wrapping the lights in Aluminum foil that's grounded to the truck would shield them and prove if it's RFI. And LEDs are already diodes, so adding more diodes won't change anything. I'd try adding a noise filter capacitor across the power & ground wires to the lights.

 

[mikeceli]

Steve83. Might you provide an Amazon link or item number, to an appropriate noise filter cap ?

 

[Big Horn]

so adding more diodes won't change anything.

Steve, it was my understanding the while LED’s typically use less voltage they can also backfeed voltage into the lines, and by putting a diode in it stops that reverse flow of voltage which can cause problems with existing circuits. LED’s are a form of a diode but not directional (other than they have to be wired correctly + / - to illuminate... am I mistaken? Maybe it’s just the low voltage from the LED’s messing with the computer that I’m thinking of and messing with the vehicles modules 🤔

I know there have been a lot of bulletins on the problems of upgrading to LED’s on motorcycles and the affect they have on the turn signal indicator bulbs.

 

[Steve83]

Might you provide an Amazon link or item number, to an appropriate noise filter cap ?

Did you search Amazon for noise filter capacitors in the automotive department?

Steve, it was my understanding...they can also backfeed voltage into the lines...

No, only something that creates voltage higher than the vehicle's charging system can backfeed voltage into the truck: batteries, alternators, piezoelectric crystals, antennas...

LED’s are a form of a diode but not directional...

The definition of a diode is that it only allows current to flow in one direction. So yes, LEDs are directional.

am I mistaken?

Yes.

...the affect they have on the turn signal indicator bulbs.

They have no effect on other bulbs. Their high resistance can make some modules behave as if the brake lights are always on, but that's really a limitation inside those modules.