GEN 2 Is it possible to rearrage/reorder your upfitter switches?

Chris S said:

I agree Ford has too much invested to put undersize wiring. That said, it is also likey the switches themselves are rated differently. With that said just moving the wires around is potentially a risky move and could easily cause smoke or perhaps a fire. The relay panel either homemade or vendor acquired, is the only safe way to move the switches around. Just my $.02 worth.

Click to expand...

Let me start with, I have not exhaustively confirmed all of the following myself (I do not have a complete set of schematics for the truck), but I believe it is this way:


For my 2018 all 6 Aux switches are the same. But if, I understand the way it works (as conveyed to me by a Ford tech), the switches themselves do not handle the current of the load, rather they each turn on a relay that turns on a load. This relay and the fused source feeding it determines the maximum current that can be supported by each circuit.


If you look at the under hood fuse / relay box (passenger side, between the firewall and the battery) you will find all the relays in question.


Aux 1 = Relay 12, 15 Amps

Aux 2 = Relay 55, 15 Amps

Aux 3 = Relay 88, 10 Amps (in none Raptor this is Multi Contour Seats)

Aux 4 = Relay 80, 10 Amps (in none Raptor this is Heated Wipers)

Aux 5 = Relay 19, 5 Amps

Aux 6 = Relay 62, 5 Amps



Is there an online schematic available for these trucks? All it would take is a quick look to set this question straight.


T!

OriginalToken said:

Let me start with, I have not exhaustively confirmed all of the following myself (I do not have a complete set of schematics for the truck), but I believe it is this way:


For my 2018 all 6 Aux switches are the same. But if, I understand the way it works (as conveyed to me by a Ford tech), the switches themselves do not handle the current of the load, rather they each turn on a relay that turns on a load. This relay and the fused source feeding it determines the maximum current that can be supported by each circuit.


If you look at the under hood fuse / relay box (passenger side, between the firewall and the battery) you will find all the relays in question.


Aux 1 = Relay 12, 15 Amps

Aux 2 = Relay 55, 15 Amps

Aux 3 = Relay 88, 10 Amps (in none Raptor this is Multi Contour Seats)

Aux 4 = Relay 80, 10 Amps (in none Raptor this is Heated Wipers)

Aux 5 = Relay 19, 5 Amps

Aux 6 = Relay 62, 5 Amps



Is there an online schematic available for these trucks? All it would take is a quick look to set this question straight.


T!

Click to expand...

This is correct. The switches are a fused trigger (F35) that go to nonservicable relays in the Battery junction Box. From the relay there is a fuse then from fuse it goes to the wires taped under the hood. The fuses between the relay and the wire under the hood can be found in the owners manual.
Below are the amp and gauge per upfitter switch. This data is from the relay that is triggered by the corresponding switch.

Upfitter 1 and 2
15amp circuits have a 16 gauge wire from the relay.
Upfitter 3 and 4
10amp circuits have a 20 gauge wire from the relay.
Upfitter 5 and 6
5amp circuits have a 22 gauge wire from the relay

Antho said:

This is correct. The switches are a fused trigger (F35) that go to nonservicable relays in the Battery junction Box. From the relay there is a fuse then from fuse it goes to the wires taped under the hood. The fuses between the relay and the wire under the hood can be found in the owners manual.
Below are the amp and gauge per upfitter switch. This data is from the relay that is triggered by the corresponding switch.

Upfitter 1 and 2
15amp circuits have a 16 gauge wire from the relay.
Upfitter 3 and 4
10amp circuits have a 20 gauge wire from the relay.
Upfitter 5 and 6
5amp circuits have a 22 gauge wire from the relay

Click to expand...

Thanks for the confirmation. Somehow or another my source said 17 gauge for Aux 1 and 2, but small difference.

For people who have not looked at this, the design used is why the same Aux switches provide so much more current in Super Duty trucks. In those trucks Aux 1 to 4 are 25 Amp, and Aux 5 and 6 are 40 Amp. But again, the Aux switch actually handles none of the current, they only turn on the relays that control the load.

T!