Just put a new battery and starter on my ford ranger and it still wont start....lights wont come on nor will my horn blow...what else could it be

To determine if you need a starter you would first do some electrical tests at the starter relay an do voltage drop testing of the starter circuit ! Without doing these test I could not say one way or another ! What solenoid did you replace ? Does yours have one on the inside of the right fender or on the starter ? Starter Voltage Drop

Check the starting circuit fuses. Most likely its a bad starter. If you can easily get at it. Drop it out attach a ground line between the body of the starter and any clean metal under the car. Have someone look at the starter while you try starting. If it does noithing when you turn the key to start, its time for a new one.

SO, would it crank before you changed the cables and battery? When you arc the solenoid does the starter actually crank?

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Replace battery terminals and/or clean battery posts. Horn and radio don't use as much juice as starting. Sounds like a lack of amperage or electrical pressure to push the starter motor. Also check battery. Needs 12 or more volts and about 600 or more cranking amps.

Clicking noise usually means a bad connection at the battery terminal. It can also be a bad connection at the starter or solenoid.
Re-clean and tighten battery cables,and if that doesn't do it,re-tighten starter connections.Don't overtighten as copper-bronze studs can break easily.If your Ranger is standard shift (4 or 5-speed), don't get under the car or in front of it without the battery cables disconnectede or the shifter in neutral,as any current you inadvertently send thru the starter can engage it and run you over or knock the vehicle off jackstands or blocks. don-ohio

Is the battery fully charged and are the connections clean and tight. Your ignition fuse seems to be blown. Check the big fuses under the hood. Will the headlights come on? will the horn blow? Good Luck!!!

check your connection to the battery might need new cable ends

Starter could be stuck..
If you are SURE you battery is fully charged with no dead cells..
Try --
(takes 2 peopl) -
Turn the key like you are trying to start it.
At the SAME time - smack the starter with a small hammer not too too hard..
Let me know what happens..

take back to dealer and have them check the neutral safety switch on the clutch because if the switch is not adjusted properly you will have this problem