Sometimes when fitting a new battery the terminals are not on really tight. First check that the contact face of the battery terminal cable clamps are bright metal. Clamp securely so that there is no movement between cable and terminal. Next check the condition of the earth return strap from the engine back to the vehicle's frame. Again ensure there is good fresh metal to metal contact and the it is secured firmly. Next check the connection on the starter motor...clean and secure again. If still no joy then it is time to check the starter motor. The most frequent fault in starter motors are worn striker contacts. When the solenoid is engaged is moves the starter motor armature forward to engage with the drive teeth on the edge of the fly wheel. At the point of engagement the electrical contacts of the motor coil core make contact with the copper striker plates. When they become worn then contact is lost. Make a note of the make and model of the starter motor and purchase a striker plate refurb. fit (about $10 from dealer or Autozone etc). disconnect the electrical cables to the solenoid and motor, remove the two securing bolts that hold the motor to the flywheel casing and remove the motor assembly. Undo the motor end retaining bolts and examine the striker plates. Change them one at a time, I say this as it is important that the order of insulation washers and nuts are in the correct order when reassembled - using the un-touched plate as a reference helps in this. Clean, but do not lubricate the interior of the motor - oil only serves to attract grime. Reassemble and reinstall the the motor assembly. Again ensure the electrical supply cables are clean and attached firmly.
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