2021 Bronco AUX Switches Wiring Diagram, Video, Discussions

[TSSPat]

I hope that is the design because it makes the most engineering sense. But... what still is confusing is the wire sizing coming from the wire loom running along the firewall (two ea. 16AWG and 4 ea. 18AWG). Based on the electrical schematic you've posted, what doesn't make sense is why the need to splice wires together in the engine bay? If the fuse and relay are in a distribution box (I'm assuming it is "Box A" in the earlier drawing), why not just use electrical spade lugs terminals on the inside of the box ( i.e. out of the elements) to start the circuit from the power-side of the relay (i.e. at "Wire 1", "Wire 2", etc.). For a factory electrical system having terminated wires with just heat shrink at the ends, seems a bit unorthodox. Why not have connectorized terminations for the two circuits behind the glovebox.

Doesn't make sense to me. Especially from an electrical system reliability standpoint.

I wonder if any of our fine members who have already taken delivery and have the know-how would mind confirming this theory for us. .

Sponsored

 

[swooshdave]

I was wondering the same thing. Is the wire harness already in place?

Very unlikely.

 

[swooshdave]

I wonder if any of our fine members who have already taken delivery and have the know-how would mind confirming this theory for us. .

I hope that is the design because it makes the most engineering sense. But... what still is confusing is the wire sizing coming from the wire loom running along the firewall (two ea. 16AWG and 4 ea. 18AWG). Based on the electrical schematic you've posted, what doesn't make sense is why the need to splice wires together in the engine bay? If the fuse and relay are in a distribution box (I'm assuming it is "Box A" in the earlier drawing), why not just use electrical spade lugs terminals on the inside of the box ( i.e. out of the elements) to start the circuit from the power-side of the relay (i.e. at "Wire 1", "Wire 2", etc.). For a factory electrical system having terminated wires with just heat shrink at the ends, seems a bit unorthodox. Why not have connectorized terminations for the two circuits behind the glovebox.

Doesn't make sense to me. Especially from an electrical system reliability standpoint.

Because it allows the most flexibility without dictating what you do with the wires. Also why add connectors unnecessarily? Best to give the owner the choice of what they want to do.

 

[mpeugeot]

Very unlikely.

Maybe, but there are likely some aspects that are there, just because it's cheaper to mass produce harnesses that way.

It comes down to efficiencies of scale vs cost of components. This will be completely dictated by which is cheaper to produce. If it's cheaper to have two different harnesses or an additional harness only for the Aux switches. That's how this will be determined at Ford.

 

[Canonman11]

My question is my Bronco did not come equipped and I see all the wiring there ran thru the bronco but will we be able to switch out the sun glasses holder for the Aux switches seems like it is a replacement of that upper plate hopefully a easy install but once we can see the parts manual for the Bronco. All the dealerships are still waiting on them.

 

[JGee]

I popped off the driver side rear access panel and I cannot see the aux wiring. Did anyone try this already and find it? Want to use that line to drive a subwoofer amp.

 

[4avor8ntfair]

I popped off the driver side rear access panel and I cannot see the aux wiring. Did anyone try this already and find it? Want to use that line to drive a subwoofer amp.

These folks talk about adding a sub, by using new 14 ga wire (they go down to 14 in a follow up video), and tying into the 6.5” floor speakers. I’m not sure if that’s how a professional shop would do it, but they say they have good results.

 

[Perfect-Beast-2]

Oh, YAY! This first mapping image is gold.

 

[mtap]

Added quick disconnects so i can easily move accessories to any switch…

 

[4avor8ntfair]

Added quick disconnects so i can easily move accessories to any switch…

My apologies if this was previously posted…do you have a link for these?

 

[mtap]

My apologies if this was previously posted…do you have a link for these?

Just cheap amazon connectors. It’s a 5 pack, i ordered 2 sets so i have extras..

2 Wire Connector, MUYI 5 Kit Electric Connector 18 AWG Connectors Waterproof Electrical Connector 1.0mm² Wire Harness 1.5mm Series Terminal https://www.amazon.com/dp/B01A6LTK4...abc_VASQGGZEV9G26ARXXWTN?_encoding=UTF8&psc=1

 

[Perfect-Beast-2]

Added quick disconnects so i can easily move accessories to any switch…

Thank you for the pictures! This is by far the best help on this matter yet.

 

[stangsdado]

I think i read where they are ignition wired, but the last two might be reworked to remain hot.

@JaxGtc Do you remember where you saw this (about rewiring switches to remain hot)?

 

[JaxGtc]

@JaxGtc Do you remember where you saw this (about rewiring switches to remain hot)?

Hi, I'm sorry I do not recall the thread, but I assume it was related to the topic of the upfitter switches. The search function is challenging, but you can give it a shot.

 

[stangsdado]

Hi, I'm sorry I do not recall the thread, but I assume it was related to the topic of the upfitter switches. The search function is challenging, but you can give it a shot.

LOL! Searched and searched and now my face is . Easy to find info on the switches themselves. It's the rewiring that's hard to find.

Sponsored