OK,on the hi-low converter the fifth wire is usually a ground wire,what brand of converter is it?.I generally only ground them if there is any "alternator" whine present in the system.The input wires will wire to the dk.blue/light blue pair for the right and the brown/yellow pair for the left.The darker on each is the (+).For your remote turn on you can use accessory power in the radio harness,but you can occasionally end up with a feedback loop if the truck is running with the radio powered down.I like to use either the TR4 module from PAC or the DEI 55000 to create a remote turn on that shuts down with the stock radio.I hope this helps,any other questions fire away.