Hi everyone,

I'm pretty much done wiring up my auxiliary high-beam lights. I used a fuse tap to trigger the relay, but there's a problem. As you might know, the 5th gen 4Runner uses PWM (pulse width modulation) to dim the high-beam circuit for DRL (daytime running light) use. Instead of lowering the voltage, it instead pulses the circuit rapidly for the high-beams to glow dimly. The problem with this is that it can still intermittently ping the relay tapped in, causing my auxiliary beams to occasionally flicker when the stalk is set to DRL. The lights work exactly as designed when flicking the high-beam switch, as desired.

I am already using a switch inline to turn off the auxiliaries when not needed. Does anyone know if a way to suppress the relay triggering inadvertently during DRL mode? An inline capacitor or filter, something like that?

Thanks,
-Tory

So, I found this thread that describes a very similar situation:

Filtering PWM on +12V circuit | Electronics Forum (Circuits, Projects and Microcontrollers)

One of the posters provides a diagram for the solution, seen here:



I'm going to order some parts to build little protoboards with this filter, and try various capacitors to find one that works. If there's any interest, I might make some extra for anyone looking to run auxiliary high beams without the PWM pinging the relay in DRL mode.