Fog Light Output Voltage

[BRNZY]

Hello Everyone,
I am trying to hook up my L.E.D. Spotlights by wiring them to my fog light harness. I am using a relay, and everything works great until I start the engine. The relay starts buzzing, and only one set of lights begin flickering intermittently? The other lights stay on as they should? I checked the voltage of the fog light lead and it is just over 9 volts? Please help...

[ehall]

Polarity wrong on one light?

[BRNZY]

Ummmmmmm, probably not. They were working fine when I had them on a normal switch.

[lpennock]

Sounds like Day time running lights. 9v is about correct for drl. The chatting is caused by the pulse width modulation they use to reduce the voltage.

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[ehall]

Sounds like a jk problem. Lol. On my tj the led fog lights work great.

[bobchase]

Yes it's a JK problem. Take a look at antiflicker harnesses on amazon. Or you could solder a small capacitor across the trigger side of the relay to hold it 'on' when the pulse goes away.

[BRNZY]

Ok, I have tried capacitors and even a 9 volt relay and nothing is fixing this issue. There has got to be a way this has been done successfully???

[bobchase]

If you want, you can come over and we can take a look at it.

[BRNZY]

Ok ..... can you send me your info? Likely will not be until the weekend after next if that is ok?

[AZJeeps]

You might need a resistor in the circuit. The relay might not be drawing enough current. The capacitor will help with flickering if it is a pulse style circuit, like the headlights. I havent messed around with the fogs yet, but i do believe they are controlled by the ecu.

[calvarez]

All lights on modern cars are controlled and powered with pulses, not flat DC. This makes bulbs last longer, and allows dimming. Relays may not like this much. I put a relay on the interior lighting circuit so I could run some courtesy lights all around the Jeep, and it only buzzes during the quarter second that the lights dim to off. But the fog lamp may be running a shorter pulse width, or you have an overly sensitive relay.

[BRNZY]

I have tried different relays (12v, 9v and 6v). All of them buzz badly while the lights flicker.