How to use uplifter switch on 40amp light bar ?

So the up-fitter cable needs to be connected to a relay.

The relay will be the box that the toggle switch from the light bar kit connects to. I am guessing that the toggle switch has three cables connected to it: Ground, Power, and Switched Power (power that turns on and off as you flip the switch). Ground you will have to connect to a vehicle ground or the negative terminal on the battery, the Power you don't need, and the Switched Power becomes the output from the up-fitter switch cable.

BEHOLD MY BEAUTIFUL DIAGRAM:



Hopefully that makes sense? If not, definitely ask questions. Note that my diagram might not fully match up 100%, not sure exactly which lightbar/kit you are using so I made a few assumptions.

RagnarKon

So the up-fitter cable needs to be connected to a relay.

The relay will be the box that the toggle switch from the light bar kit connects to. I am guessing that the toggle switch has three cables connected to it: Ground, Power, and Switched Power (power that turns on and off as you flip the switch). Ground you will have to connect to a vehicle ground or the negative terminal on the battery, the Power you don't need, and the Switched Power becomes the output from the up-fitter switch cable.

BEHOLD MY BEAUTIFUL DIAGRAM:



Hopefully that makes sense? If not, definitely ask questions. Note that my diagram might not fully match up 100%, not sure exactly which lightbar/kit you are using so I made a few assumptions.

Yes this makes sense . To determine the power wire that I don’t need of the three wires I’m guessing it will be the one that is hot to the switch when switch is off ? Thank you and the diagram is spot on.

Sdge

Yes this makes sense . To determine the power wire that I don’t need of the three wires I’m guessing it will be the one that is hot to the switch when switch is off ? Thank you and the diagram is spot on.

Yes. It’s often a red or white cable… but… can’t guarantee that’s the case in your kit. Multimeter/voltmeter should be able tell you easily.

RagnarKon

Yes. It’s often a red or white cable… but… can’t guarantee that’s the case in your kit. Multimeter/voltmeter should be able tell you easily.

Thank you.

I'm probably missing the point, but isn't the upfitter switch already connected to a relay? I thought everything was wired and powered and you just needed the positive/power from under the hood that is already connected to a relay?

AcesandEights

I'm probably missing the point, but isn't the upfitter switch already connected to a relay? I thought everything was wired and powered and you just needed the positive/power from under the hood that is already connected to a relay?

You are 100% correct. All of the upfitter switches are controlling a series of relays sitting in the battery junction box (BJB).

BUT, @Sdge light bar is 40 amps, and there is no upfitter/aux circuit that can power a 40 amp light bar. Those largest aux circuit, Aux 1, supports 30 amps. But obviously if you are controlling something that pulls more than 30 amps, such as the larger refrigerators, a compressor, high-powered light bar, etc... you have to start stacking relays on top of each other.

Understood and makes sense.