The touchless wash blow water horizontally into the wheel wells and can spray water up towards the altenator wheel, causing the charge light to come on due to the voltage drop.
Most car washes have the guy who washes/scrubs the wheel and power washes it off before the wash rinses the car. Because its a guy aiming at an angle you woul dnot get the water flow of the touchless systems, which is why most wont get that. You can always get some 3m tape and just re-enforce the innter well areas, and the tape is waterproof and heat resistant and wont interfere with the engine at all.
But in warmer climates it might add heat.