How many devices can I attach to my remote turn-on lead?
5.11 How many devices can I attach to my remote turn-on lead? [IDB]
The remote turn-on lead that most head units will not provide very much current (usually 250-300mA), so there is a limit to the number of components you can activate with it. Generally, it is safe to hook up two devices to the lead without having to worry about problems. However, if you'll be activating more components, then you should probably use a relay.