Quote:
Originally Posted by rageandlove
Super! Will be interested to see if you actually need a relay. Was not required in the Tacoma LED conversion harness.
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I'm not sure that you really need a relay to drive the low beam LEDs from a halogen type low beam wire harness, but one question is whether the LEDs can handle spikes above 12v, which might happen on the regular halogen wiring... so my thought was to be extra careful and have a 12v regulator that's directly powered by the stock halogen low beam wiring. This would ensure no voltage spikes get to the LEDs. This might be total overkill though if the LEDs have their own built in regulators, which they very well might...
For powering the high beam shutter in the low/high LED projector, I think you really need a relay instead of powering it directly from the stock high beam halogen wire. Reason I'm thinking this is the stock high beams get PWM power when in DRL mode and if this is directly connected to the low/high LED projector shutter I'm not sure what this would do to the shutter...
Not sure which option is better, but my thoughts are one of these should work:
1. Shutter power provided by stock halogen high beam wire and this power is switched by a relay based on the low beam power. Shutter wouldn't see any power unless the low beams are on which wouldn't happen when in DRL mode.
2. Shutter power provided by the low beam wire and switched by a relay based on the high beam power. Shutter wouldn't see any power unless the high beams are at full voltage (not DRL PWM voltage). Not sure how relays behave with PWM, but I think this would work, just would need to read up on this a bit more. Think the effective relay switching voltage has to do with duty cycle of the PWM and the input voltage or something... I like this option better because the relay won't cause any voltage drop for the LEDs. This option requires the halogen high beams to be on with the LEDs when in high beam mode. Think that's ok with me but it will be crazy bright.