Mopar AUX + Mopar Offroad Lights Question

[RadicalRonin]

Hey all,

Question: Can I hook the Mopar 7" Offroad lights (Part#: 82215386AB) and the Mopar 5" Offroad lights (Part#: 82215385AB) both to AUX 1 (40 AMP).

Background: Currently the 5" lights are connected to AUX 3 and the 7" to AUX 4 (both 15 AMP). The instructions explicitly state that for each of these lights they should be connected to Either AUX 3 or 4, and NOT AUX 1 or 2. I am unable to find the AMP pull on each of these lights (if anyone knows it would be much appreciated knowledge), and I would assume that if it was less than 40 AMPs, it should be fine to connect to the AUX 1 or 2, but then why would Mopar explicitly state that the lights should NOT connect to those connections? Burnout on the LEDs? Heat issues?

The main reason for the rewire is that we're installing some rock lights (LUX 8 pack/white: https://luxlightingsystems.com/coll...-piece-ground-coverage?variant=40461180305571) and would like to wire them to AUX 3, and we also have several more Mopar 5" lights that will be mounted to a sports bar (6, 5" lights in total) which I would assume we could connect to AUX 2.

Technical explanations welcome and encouraged so I fully understand the problem.

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[Mash5]

The fuse protects the wire from overcurrent conditions that would cause it to get hot and potentially cause damage or a fire, such as a short. If the wire in the harness for your lights is sized for a 15amp fuse and you connect it to a 40 amp fused circuit you have undermined the protection.

I have been meaning to track down the fuses on mine but I would assume it would be possible to replace the 40 with a 15 and thereby maintain proper protection of the harness wiring. If you did this I can’t see a scenario where using the previously 40amp circuit would be a problem. The heavier wire of Aux 1 or 2 would just be over protected by the now smaller (more sensitive) fuse and the lighter harness wire would be properly protected.

 

[RadicalRonin]

That makes total sense, i wasn't even thinking about the fuse, i was just thinking about the LED aspect.

I checked the jeep manual for my JT and it shows the aux switches and fuses (looks like F93 for AUX 1). The only concern left to figure out is the total amperage pull of the lights combined to make sure that's not above 15. If that's the case, I might as well just put them all on aux 3 or 4.

I also suppose i could add an inline fuse....

 

[Mash5]

The only concern left to figure out is the total amperage pull of the lights combined to make sure that's not above 15. If that's the case, I might as well just put them all on aux 3 or 4.

I also suppose i could add an inline fuse....

If you are going to put two sets of lights on one aux circuit, an inline fuse at the point they split would protect each leg with its appropriate fuse. Again the fuse protects the wire, not the device.

Also, keep in mind that automotive fuses are slow. If you pull say 16 amps through a 15 amp fuse it may take 60 minutes to pop. They are mainly there to protect a dead short.

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