Put key in ignition .All lights come on nothing happens battery ok starter n alternator ok battery ok b m w 318 ti

do the dashboard lights go out when key turned to start? when you say nothing happens,is there a click? does the motor turn over,but not fire? is it an automatic,meaning is the gear inhibitor switch preventing starter from working?have you tried a jumper battery?putting a jumper lead from the battery earth to the engine ground helps sometimes,if earthing cables broken

Check a live feed is reaching ignition switch!

What happens when you turn the key to on? Do the warning lights and gauges come on? Turning the key to start, do the lights and gauges stay on? Just nothing at the starter?

Or does power just shut off when you turn the key to start, everything goes out, no warning lights or gauges? Then check cables, battery terminals, grounds for clean tight connections. There is a problem between the battery and the ignition switch.

If the switch still receives and sends power out (to the dash, for one) but start circuit is not working (from battery to ignition switch to clutch switch to starter relay to starter solenoid to starter to ground-and back to battery), then here's where we at: with key off, use a small screwdriver and short the big cable at starter to the starter solenoid small wire connection, or use a small jumper wire to do the same-battery cable at starter to the small wire connection on the starter solenoid. Starter motor should spin and crank engine. Does it? If so, start checking the start wire out of ignition switch for power when key is held in start. If you have a clutch switch, check for power in with key in start. Should have battery voltage to the clutch switch with key held in start. Keep checking the start wire along the start circuit. Not sure how the start relay is wired into the circuit, would have to see a diagram, but if you pull the relay out and use a test light or multi meter, could check for power on the terminals where relay plugs in. Key off, should have one terminal that is hot. With key held in start, at least one other terminal should also be hot. This would be the start wire out of ignition switch sending a signal to the relay.
Good luck, hope you find it. Sorry I don't have a wiring diagram to help you more.

When you turn the key to start does the starter engage an spin the engine ? or nothing happens .
the lights and music come on but the motor will not start when I turn the key ??????? Will not start how ?
crank - no - start or no crank no start . ????????

IF IGNITION SWITCH FUSE GOOD THE IGNITION SWITCH FAULTY MORE LIKELY.

have battery and charging system checked. you may have a bad starter.hope this helps.

Check battery full charge, battery terminals are clean, cables aren't cracked, broken or corroded and alternator first.

Which your having replaced your starter with new already. If you're still getting nothing it sounds like a bad ignition switch.

They wear normally and need to be replaced. But as a helpful hint don't place excess keys or weighty trinkets on your ignition keys.

They wear on the seating of the key in the ignition and often promote failure in the ignition from bearing the dangling weight.

it seems that your battery is not charging..either you need a replacement or it is a faulty alternator which is not charging the battery.First thing I would suggest is to check if the alternator is producing power by a voltmeter.

Why not eBay? you may be able to find a "lightly" used harness from an appropriate dodge or Chrysler product that uses your engines?
Try for a Repair manual or electrical repair segment for an appropriate Chrysler product with your engine.
http://www.manualslib.com/

I think your starter went out not the alternator. chk. the starter.