Replaced aftermarket under bumper incandescent reverse lights with LED units. Now backup sensor system activates whenever in reverse. Why?

1004 Views 6 Replies 3 Participants Last post by Steve83, Sep 24, 2021

mikeceli

Discussion Starter · Sep 22, 2021

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

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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.

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Big Horn

· #2 · Sep 22, 2021

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.

2002 F350 7.3L / 4R100 - 4WD CC DRW Dana 80 4.10 gears, 8’ Box, IAH Delete, Gauges: Pyro, Trans Temp, Boost, Fuel Pressure, Scan Gauge 2, GPR LED indicator, Voltage gauge, low oil pressure gauge, TS-6 tuner, Zoodad Mod, Walker Big Truck Muffler, Mishimoto 31 row Trans cooler, Mobil 1 ATF, Baldwin filter base / screw on filter on the A/T cooler rerun line, Using Mobil 1 ATF in Power Steering and Transfer Case, Amsoil Gear Lube in both differentials, Hutch/Harpoon Mod, Air Lift - Load Lifter 5000 rear air bags, Rancho 9000 shocks, FAGbrand front (unit bearing) wheel hubs, rebuilt the locking auto hubs, Timbrens on the front, custom built front hitch / 17,500# remote winch, Big Tex chrome grill guard, Dorman replacement bed support channels, T-Rex spray in bed liner. White Rodgers GPR, Power Master 9501, XDP Coolant Filter

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Big Horn

· #6 · Sep 23, 2021 (Edited)

Steve83 said:
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.

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