2005 Chrsyler 300 remote start

I put  a remote start on a new 300 with the 3.5 litre V6 engine.  It was setting codes it the computer wouldn't let the chrsyler computer reader read the computer and the whole electrical system was having problems.  IE crusie wasn't working and so on.  I dissconnected everything and  started cutting wires from remote start.  I had cut everything and it was still screwing up the last wire I cut from the vechile was a blue/brown wire at one of the coils for my tach source.  After I cut this wire everything went back to normal in the car.  And at this point my tach wire was only a 5ft long piece of wire not attached to anything.  But some how this screwed up the enitrie electrical system.  If anybody has any ideas please let me know thanks.