The XMOD Generation 1 power switch is unreliable and very inefficient at passing current. We recommend bypassing it entirely. Many EPs will work intermittently and the power switch is often the culprit.
If you are putting stacked FETs onto your car you will no longer be able to use the stock power switch anyway, so you may as well bypass it to eliminate the power loss associated with it. Even a stock XMOD Gen1 will benefit from a switch bypass.