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Try a direct line from your battery to the solenoid.
-no sparks as you attach = either solenoid is open circuit or the engine earth strap is faulty
-buzz but no movement = solenoid siezed
-solenoid operates = problem in wiring/switch to solenoid.
Check the starter solenoid and the connections from the battery to ground, battery to fusebox, ignition key switch, neutral or park safety starting switch, solenoid, and solenoid to starter. Make sure you have ignition key switch wires connected to the solenoid - without them - the solenoid can not close to send 12V to the starter.
Is the solenoid getting power when it shouldn't be ? Faulty key switch ? The solenoid should only get power from the key switch in the start position. Was the problem happening before you replaced the solenoid and starter ?
have checked if the power comes to the solenoid is powerful or do you have before solenoid any broken wires inside the wiring cover and drops the currency? Measure the power by using an ohmmeter.
Are you not getting voltage to the battery post on the solenoid, or the terminal for the wire from the key switch ? You have a neutral safety switch between the starter and the key switch if that is the circuit in question. Also take a look at the ground cable and connections.
It can be many reasons but then you must check for the starter motor voltage from the solenoid switch. So if the key switches the starter, the solenoid should receive the voltage , switch on and then supply voltage to the starter.
So if no power to solenoid, check the key switch.
If power comes ot solenoid but no output to starter, then change solenoid switch
However if voltage comes to starter but does not turn then starter coils, brushes are faulty. repair or replace.
Hope this advice helps, credit if helpful.
Use a test light and check at the starter solenoid and see if the ignition start wire gets hot when the key is turned to start. If it does check to see if current then goes thru the solenoid to the starter. If it does check to see if current gets to the starter, if it gets to the starter the starter is bad. If no current to the starter or out of solenoid the solenoid is bad. If current does not get to the solenoid when switch is turned, check and see if the current goes thru the neutral safety switch (Clutch switch if not automatic). If the current doesn't go thru the switch replace the switch. If you are not getting current to the switch in the first place check the ignition switch. If the current doesn't come from the ignition switch to the safety switch replace the ignition switch.
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