12 voltage at the ignition switch, but at the solenoid starter is getting 6 volt only.

 

Bad positive cable is my guess

 

It's not the cable, if it were all voltage readings would be 6 volts except at the battery.

The 6 volt wire, what's the wire's color?

 

The color of the cable is black with white strip. It is the cable coming from the ignition switch.

The voltage drop to 6 volt when trying to start. No crank

 

Disregard the 6 voltage reading at the B/W wire. Instead just test the starter. The 6V is not enough info to determine which part is defective.

Assuming your battery is good.

1. Make sure the car is in Park.
2. Disconnect the B/W wire from the starter solenoid post. Run a hot wire straight from the battery to the starter solenoid post (tapping to crank the starter). If the starter doesn't crank then the starter is defective... Replace the starter.

If the starter cranks the you have a bad connection from the battery. Find the bad connection.

 

2 starter and the car stiil doesn't crank.
THis is the second starte anx the car sticar doesn't

 

Did you hot wire the starter as noted in #2 above? If not please do so because that will confirm that the starter works and the starter has a good ground. There's no point in moving on until you can confirm those two things.

The reading of the 6v you got before, was the wire still connected to the starter or was it disconnected from the starter when you got the 6 volts?