Heated Seats Help

I know this subject has been discussed extensively on the forum but I seem to have run into an undocumented issue. Rather than purchasing through Ebay, I cheeped out (if you can call it that) and went through aliexpress.

https://www.aliexpress.com/item/329...03e69295-0&pdp_ext_f={"sku_id":"66190462881"}

This kit looks identical, however once delivered it turns out that the wiring harness only has three input wires. A fused red wire (I assume 12V high current input), a black wire (Ground), and a yellow/red (unlabelled). I initially thought this is the 12V control wire and I just wouldn't have a "night light" circuit (stinks but whatever). So I took the rocker switch apart and bench tested with a 9V battery. I'm now more confused than ever. There are 4 wires running to the back of the rocker switch - red, tan, black, and the yellow/red (control). The tan is the 12V low circuit, red is 12V high circuit, black is ground, and yellow/red is labelled as "12V". When i put 9V on the "12V" yellow/red pin, I got a blue LED illumination (LED3 on the last picture). Hope that all made sense. My question is - how do I wire this. Is my control wire actually a nightlight wire as seen on other versions of this kit? Did they combine both into one wire? I think what I need to do is wire the high amp red wire to a high amp circuit that is only on when the car is on. Then just wire the red/yellow to an accessory that is on with the lights (as a nightlight). Is it this simple? What am I missing? Will this eliminate the need for a normal "control" circuit seen by the other kits? If I do use it as a control circuit, the light will always be on. Thanks for any help you can provide. Hope this all makes sense and some guru can assist. Pictures attached.

 

Here's the directions I got with mine. Mine were the dual dial switch kit and I think you got the single-dial switch kit harness? Seems to me like red is to always hot. And red/yellow will go an ignition source and possible trigger the lights?

Also, not sure how you're getting power but I pulled mine from the circuit for the brake controller since I don't use it. Added a small fuse panel. Grabbed switched power with a fuse tap so they turn off with the car.

What you have?
SINGLE-DIAL SWITCH KIT
A. RED WIRE - CONNECT TO ACCESSORY +12 VOLTS - 10 AMP CIRCUIT.
NOTE: IMPROPER INSTALLATION COULD LEAD TO BATTERY DRAIN IF CONNECTED TO A CONSTANT BATTERY
SOURCE.
B. RED/YELLOW STRIPE WIRE - CONNECT TO IGNITION +12 VOLTS - 5 AMP CIRCUIT.
C. BLACK WIRE - IT IS RECOMMENDED TO CONNECT THE RING TERMINAL TO THE VEHICLE BODY USING AN
EXISTING COMMON GROUND POINT. IF ONE IS NOT ACCESSIBLE, CONNECT TO A GROUND WIRE WITH HIGH
CURRENT CAPACITY.

What I got. The yellow was the light trigger...
DUAL-DIAL SWITCH KIT
A. RED WIRE - CONNECT TO ACCESSORY +12 VOLTS - 20 AMP CIRCUIT.
NOTE: IMPROPER INSTALLATION COULD LEAD TO BATTERY DRAIN IF CONNECTED TO A CONSTANT BATTERY
SOURCE.
B. RED/YELLOW STRIPE WIRE - CONNECT TO IGNITION +12 VOLTS - 5 AMP CIRCUIT.
C. YELLOW WIRE - CONNECT HEADLIGHT/NIGHT LAMP +12 VOLTS - 5 AMP CIRCUIT.
D. BLACK WIRE - IT IS RECOMMENDED TO CONNECT THE RING TERMINAL TO THE VEHICLE BODY USING AN
EXISTING COMMON GROUND POINT. IF ONE IS NOT ACCESSIBLE, CONNECT TO A GROUND WIRE WITH HIGH
CURRENT CAPACITY.

 

I'm not sure? I got a kit that has two seperate switches (each switch has it's own high/low setting). I'm not sure if that would be considered "dual-dial" or "single dial". I would guess it's "dual dial" since I have two of them? But then again, the single dial installation instructions would make sense based on wires available. Thank you for including them. I'm still trying to wrap my head around the schematics but maybe I shouldn't think too hard about it.

 

Yeah, I agree on the dual making sense but you're missing the yellow wire. Personally I'd test it all out by just touching the wires to the battery (maybe disconnect the battery terminals just to be safe). Red to positive and black to ground and see what happens. If I'm thinking this right nothing should happen. Then when you touch the red/yellow to the positive everything should work and maybe the switch light up.

That's how mine is wired. Red to constant power, black to ground, red/yellow to switched power and yellow for illumination. Think it should be the same minus the yellow.

But I take no responsibility for my suggestions!

Here's the harness I made and fuse block I added to power mine from the unused brake controller circuit.

 

I wired/piggybacked the high amp (heater) 12v to the “cigarette lighter”. There is another circuit, I guess what you call a night light, that I did not hookup. The light circuit fuses are in the engine bay. So I skipped it. The switch lights up when the seat heaters are on.