LED Headlights: Turning on the fogs turns on the high beams, too!, New behavior, fogs worked normally until LED headlights installed. Options

[orthobiz]

I love my brand new GE Nighthawks. There is no way I could go back to regular headlights. I had a set of sealed beam Hellas.

Last night I turned on the fog lights for the first time and the high beams came on. When I looked at the front of the car, all three were on: the regular lights, high beams AND the fog lights.

Any fix for this? I would like to have the fog lights and the low beams on at the same time without the high beams.

Edit: up until I installed the LED headlights, turning on the fog lights did NOT turn on the high beams. And turning on the high beams turned OFF the fog lights. In other words, normal behavior.

Thanks,

Paul

[Spoke]

Seems when changing to LEDs one should expect issues and then be pleasantly surprised if no issues arise.

For LED turnsignals likely the OEM flasher relay will need replaced. It's an absolute must with the 911 as its OEM flasher will hyperflash even if one turnsignal front or rear is replaced with LEDs.

For 911's with cruise control, if all brake lights are changed to LEDs, the CC will not engage. Turns out the CC ECU dumps about 7ma into the brake lights. With incandescent bulbs, this is not a problem. With LED brake lights, the light will glow dimly as LEDs will light up even with a tenth of a milliamp.

The 911 CC ECU monitors the voltage on the brake lights. I couldn't put enough ballast resistance on the boards to allow the CC to function properly. What solved this was the pigtail below with two 12 ohm 50W resistors in parallel. One 6 ohm 50W resistor could have been used but it would get too hot if one engaged the brakes for a long period of time. This pigtail is inserted in series with the brake light switch on the brake master cylinder.