I have a 400 watt power inverter that I am going to use for my carputer. It is going to be hooked up to the secondary battery I have in my spare tire well. Problem is, if the car is turned off, the power inverter would still be on. I hate to have to turn the power inverter on and off every time I get in and out of the car. Can I use a relay from the ignition wire, or from the remote turn-on wire of my head unit, so that the power inverter will receive power only when the car is on or head unit is on? I already have a relay hooked up to the remote turn-on lead off my head unit to my 4 amplifiers, so could I simply run an extra wire off that to a relay for the inverter. Any suggestions?
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how can I wire up power inverter to secondary battery, but turn on when car starts?