Hey guys, getting ready to install some Morimotos in my buddy's 2500, he has a Canadian big horn (low beam DRL) with the halogen lights.

Instead of running the fuse tap to make the LED DRL Strips work like suggested with the headlights, I'd like to go into ALFA (Aftermarket BCM Software) and switch the DRL from low beams to Park Lights, then on the Morimoto Lights wiring harness I'll use power from one the two Incandescent bulbs for the park light circuit and use them to power the DRL Strips.

My goal is to basically delete the dual filament amber incandescent park light and only use the bulb for signal lights.

Assuming I can't make the changes in the computer to trick it to avoid light out error messages I'll need to run resistors.

The bulb is currently a 5w-21w dual filament bulb, I'm wanting to simulate the 5w load on both circuits since the DRL LED will draw negligible power.

I don't believe I should merge both park light circuits per headlight to power the DRL and run a single resistor as Im not sure how the BCM would respond to that.

Due to these lights basically being on all the time the truck is running I really want to size the resistors with some factor of safety. Math tells me I need around a 5W 40 Ohm resistor per circuit.

Any suggestions from the community on the best resistors to run in this situation? I'll be pre making a harness to plug into the 7443 Bulb harness make so I can mount the resistors to a heat sink to make ease of installation easier and not hack up the wiring on the back of the headlight.

As seen below I don't want to see the orange lights ever again, want it to look more factory without them.

Thanks,

 

Install the resistors in a well-ventilated area or on a metal surface to dissipate heat effectively.

 

Welcome to AAC.

If you want (or need) 40Ω 5W resistors I'd recommend double the wattage capability.
These
https://www.amazon.com/uxcell-Watt-Aluminum-Housed-Resistors/dp/B00HR5S59O/ref=sr_1_4
are just such an animal. OK, they're 39Ω but at 5% they can be anything from 37.05Ω to 10.95Ω. If you can live with those numbers - - - .

Why 10W? Because at 5W you're running at max wattage. You always want to leave some head room. Plus, the link has Two resistors for $9.69.

I don't know if this will solve your BCM or not. But it's not an expensive experiment, and I can't see it causing any problems.

 

Welcome to AAC.

If you want (or need) 40Ω 5W resistors I'd recommend double the wattage capability.
These
https://www.amazon.com/uxcell-Watt-Aluminum-Housed-Resistors/dp/B00HR5S59O/ref=sr_1_4
are just such an animal. OK, they're 39Ω but at 5% they can be anything from 37.05Ω to 10.95Ω. If you can live with those numbers - - - .

Why 10W? Because at 5W you're running at max wattage. You always want to leave some head room. Plus, the link has Two resistors for $9.69.

I don't know if this will solve your BCM or not. But it's not an expensive experiment, and I can't see it causing any problems.

Thanks for your input, I ordered those in to give them a whirl!