Hi There
I see in your original message you mentioned that your current configuration is already powering one pair of aux lights, which will hinder your configuration for the heated gear.
Keep in mind that the Gen I ezCANs only support 1 set of aux lights, which you already have configured. So with this in mind, when you try to alter the brightness of the channel (intensity of your heated gear), it will also change the brightness of the lights.
An alternative depending on the amperage required by both the aux lights and heated gear, could be to add your gear to one of the channels, which will give you
some control in terms of intensity for high/low beam, but this is of course not ideal and I'd advise against it, due to the gear not receiving constant power from the channel if you have some of the features enabled like strobing.
The best alternative here would be to look at getting a Gen II device, as it supports heated gear with your grips button on the handlebar. If those two settings are not sufficient, you can configure another channel to be aux light set 2, which will allow you to control it with the wonder wheel as explained here under step 4:
https://www.hexezcan.com/software/Kind regards
Ruan