Common ground systems

[caraudiogod 10+ year member]

How do you hook up a 4 channel head unit to an old common ground speaker system?

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[gregj9 10+ year member]

do you mean common ground like some of the old ford lincoln mercury cars that had the negative to the chassis or the systems that all speakers were on the same ground running one wire to the hu. In the first case wires need to be run for each negative in the second scenario, all you need to do is find out if the ground runs from the deck around the car to each speaker or if there is a place where all the wires splice together centrally and go to each speaker and then to the deck and run wires from there if the wire goes around the car to each speaker, you will once again have to run wires

 

[phattyex 10+ year member]

if you are doin a 4 channel amp your best of to re wire all 4 spkrs

 

[dr. no 10+ year member]

You have to buy a crappy little adaptor. Just call crutchfield to find out which one. I also would recommed rewiring your speakers and say to hell with the floating ground factory system