Marker Lights

[mike12193]

Do they even make a cartridge type fuse tap? Being the cartridge fuse is rated at 50 amps I wonder if the trailer camera can supply that much amperage for whatever else is on the circuit. I wonder if F32 is also providing power for the marker lights of the trailer plug. Quick question, Did you test to see if the F32 does energize when the headlight switch is activated or is energized with the ignition. If it is energized by the ignition the BCM may control the marker lights.

 

[Eighty]

Or wait less than a month for a plug and play Tazer DT.

I have a Tazer on my TRX, but still choose to use the fuse-tap method. One, the Tazer is a space cadet and doesn't always work. Two, I sometimes remove the Tazer (like when I take my truck in for service).
There's also a chance that the Tazer might not work with the 2025's (or might not be able to control the marker lights).

 

[Eighty]

Do they even make a cartridge type fuse tap? Being the cartridge fuse is rated at 50 amps I wonder if the trailer camera can supply that much amperage for whatever else is on the circuit. I wonder if F32 is also providing power for the marker lights of the trailer plug. Quick question, Did you test to see if the F32 does energize when the headlight switch is activated or is energized with the ignition. If it is energized by the ignition the BCM may control the marker lights.

The BCM definitely controls the marker lights. That's what this hack does - takes the BCM out of the equation and converts it to ignition power.

 

[Rho5280]

The BCM definitely controls the marker lights. That's what this hack does - takes the BCM out of the equation and converts it to ignition power.

Makes sense. I’ll be using the Tazer for several different options rather than just the Amber DRLs just as I did on my TRX so will be holding off likely. My previous Tazer always worked perfectly.

 

[jb37]

Do they even make a cartridge type fuse tap? Being the cartridge fuse is rated at 50 amps I wonder if the trailer camera can supply that much amperage for whatever else is on the circuit. I wonder if F32 is also providing power for the marker lights of the trailer plug. Quick question, Did you test to see if the F32 does energize when the headlight switch is activated or is energized with the ignition. If it is energized by the ignition the BCM may control the marker lights.

Yea this is what I’m trying to dig into

F32 cartridge fuse is “female” … with the prongs being on the PDU (fuse box itself) … so if there was such a contraption as a 50 amp tap …. Trying to find one and see how you only feed one side

Thinking it would be something like this guy here - https://www.nhoverland.com/products/copy-of-micro-2-add-a-fuse
(Although this states only up to 30 - so the wire gauge may not be rated for 50amp)

 

[Eighty]

Yeah, I didn't notice that the F32 fuse is one of those bigger ones (Mcase?). To be honest, I don't know that a fuse tap is necessary on that side. Hear me out...

Once you've tapped power from F62 (and have a Micro2 fuse tap capable of 50A, with a 50A fuse installed), all you're trying to do is get that power to the "receiving" side of the F32 slot. Since that slot has male prongs in it, you really just need to splice on a wire with a female spade connector of the right size. Then plug it in.

 

[jb37]

makes sense - yea just a spade connector that fits on the one side ... just trying to keep myself from this:

 

[Eighty]

As short as the distance is between the two, I wonder if you could crimp a spade connector directly to the end of the first fuse tap. That would be super clean. The ones I have are about 6” long.

 

[jb37]

Yea I have the taps like you showed in the diagram

What’s your thoughts on actual fuses … put this on the F62(trailer) side with the right size fuse in the tap

Should I splice it to something like this to hold the 50 amp side with a female spade on the end for the F32 side ?

 

[Eighty]

Yea I have the taps like you showed in the diagram

What’s your thoughts on actual fuses … put this on the F62(trailer) side with the right size fuse in the tap
View attachment 4961

Should I splice it to something like this to hold the 50 amp side with a female spade on the end for the F32 side ?
View attachment 4962

Well there are two slots in the tap. The one closest to the prongs replaces the original fuse (i.e., feeds power straight through). I don’t know if the RHO’s have a trailer camera, but it certainly wouldn’t hurt to put that 10A fuse back in there. Then you’ll need a 50A fuse for the outer slot. That would be it. Both lines are fused now.

 

[jb37]

The BCM definitely controls the marker lights. That's what this hack does - takes the BCM out of the equation and converts it to ignition power.

@Eighty - now Im wondering about the BCM controlling the markers ... the left lead of F32 seems to be constant 12v
going to give it another 15-20 min to see if "full power down" is just taking forever

 

[Eighty]

Hmm. Could be permanent power, but switched by the BCM downstream of the fuse box? That would be weird.
Since you’ve got the fuse tap there…try tying it into the cold prong and turn on the engine. That will tell us the story.

 

[jb37]

well - back to the drawing board .... F62 (trailer) for sure only powers on with the vehicle, I tied it to the cold side of F32 .... Markers did not come on .. either in power on (not started), or full run/started, with power applied to cold side (I validated with a meter) .... the markers did come on with light switch moved to on (or auto in the dark) ... so maybe a down-stream circuit specific to the markers (it is hard to believe that would be a 50 amp circuit anyway - with just a handful of LEDs)
No smoke ... gotta say - a little nervous - and I trust my electrical skills.

 

[Eighty]

Well, that stinks. Just to make sure you had it set up correctly…you had the fuse (in the fuse tap) on the outer side so that the voltage passed through the wire, right?

 

[jb37]

pretty sure I had it right .... pinned the fuse tap to the right post of F32 (which was the "cold" side) ... and validated with a meter that pole had power with the truck on (power coming from the fuse tap wire)

 

[cconnorhtx]

Just wanted to say how much I appreciate you guys working on this - and the 'smoke-free' trial and error

 

[jb37]

noticed F36 is also listed as BCM exterior lights - might pull that one later and see if it has any impact on markers

 

[Eighty]

noticed F36 is also listed as BCM exterior lights - might pull that one later and see if it has any impact on markers

Well, based on @jb37 ‘s initial fuse-pull, it appears that F32 is definitely the power source for the markers. But that stinking BCM is somewhere downstream controlling things. That’s definitely a change in the RHO. With the TRX, it was upstream of the fuse.

 

[Eighty]

@jb37 - thanks for giving it a try. At least we know now.
At this point, I need you to trace the wires from the clearance lights all the way back to the relay that the BCM controls. It might involve taking off several panels and/or dropping the engine. Let me know what you find, thanks.

 

[jb37]

Only a few zip ties holding the motor in right ?