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I’ve installed a pair of your LED 5×7 headlights in a 2005 IH 9900i. Hi and Lo beams work, but with just the day time running lights on they flicker and strobe. turn on the headlights and they work fine. What’s up with this?

Grote's Answer

On 2007 and newer Jeeps the electrical system uses Pulse Wave Modulation to power the DRL module. For halogen bulbs, this is not a problem as the small breaks in the current flow between pulses is faster than the filament “loses its glow”. However LEDs are an instant-on light source so any gap in the current will cause the light to go out, or in this case flicker. The high beams and low beams do not use PWM hence no flicker. There are a number of aftermarket pigtail capacitors available to solve this issue.

Lighting Questions
Updated Mar 13, 2015

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