My car wont start! battery is good starter is good and starter relay is good! what could it be

how about starting with using a meter to check power to relay --starter-wiring-connections-key failure -ignition switch[system]-before touching or jumping to ecm

What is year--make--model?
Make sure battery has a full charge and battery connections are all good. If your saying starter motor won't crank, check voltage and ground at the starter motor. Usually two voltage circuits at the starter, one comes from the battery, hot all the time. The other circuit goes hot with key in the crank position and in your case, I suppose wired through the starter relay. The relay has two circuits, the load side and control side of relay. The control side of relay needs voltage and ground to energize the relay. The load side of relay, in a diagram shows a line with arrowhead, when relay is energized, that arrowhead line moves to other terminal and that circuit carries voltage to starter. The voltage for load side of relay is usually hot all the time. I can't rule out neutral or clutch switch. The starter motor usually grounds through the engine block. If all voltage and ground circuit for the starter are good, I'd have to make sure the engine isn't seized.
Any testing at the starter, make sure tranny is in park or neutral and functional parking brake is set.

Starter good, battery good, still wont start... - YotaTech Forums

www.yotatech.com/f2/starter-good-battery-good-still-wont-start-251448/

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first make sure battery is charged if so then then check the relay in the fuse box under the hood find the relay that marked "ing" pull that relay then find a nother one to inter change with it, if car still wont start then ou will need to see if the in line fuse on the starter wire is good or blown if its good then you will need to pull the starter and replace it. hope this helps you

Check this out > Troubleshooting No Start Problem Why Won My Car Start What To Look For...

And this site > Car clicks once and wont start tried jumping replaced solenoid starter... < this site does have a soluation.

Good Luck

with a faulty relay , the starter would not turn the engine over

The problem is in the wiring harness,yes the battery and starter is good, the harness you repaired is the PRNDL. for the starter to start it need a path when the vehicle is Park or Nuetral,there the path is closed some how by Park and Nuetral the path is open.Thats why there is a no start.when in park or nuetral the path is closed.

ck your starter relay or ck terminal on starter or battery for bad connection most likely thats the problem

if car wont start.make sure your battery volts are 12.5.if not charge battery.or replace it if dont hold a charge.if battery is good engine wont turn over.make sure battery cables is clean and tight if all good no start .have starter and starter solenoid check.if battery and starter is good.check for fuel .has some one turn ignition to the on position.go to rear of car listen for fuel pump noise.if your hear fuel pump check ignition system for spark.go to auto parts place buy a spark tester.if you get no spark .check .ignition fuses and ignition module.if you hear no fuel pump.replace relay or fuse.if if fuse and relay good replace fuel pump.if every thing good .your car could have crank sensor problem. or your car is in theft deterrant mode.if so have your car towed in and scanned.

Check the Starter Solenoid mounted near the battery.Check it out in the dark...have someone try to start it and see if it sparks at the solenoid.connections may be loose.Also check/wiggle wiring harness to starter.