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Do you have a battery tester or anyone that can load test your battery ?
I would make sure the battery terminals are clean and tight and then load test the battery.
To me it sounds like your battery is weak/bad ,some of the cells are death , you will get your 12 volts reading but under a load it fails.
Let me know.
Please rate my answer if I have helped.
Thank you very much.
I am sorry I misread that...
Ok, using your voltmeter check for 12 volts on the small wire at the starter when turning the ignition key to start the engine,will need someone to help here.
Also with voltmeter ,check for 12 volts on the fat cable at the starter and also for good ground at the starter body.
Inspect the cables to the starter and ground cable to the engine make sure they are clean and tight.
When you turn the ignition key to start the vehicle ,do you hear any noise from the engine ,like... tack,tack, tack ?
If possible I would do the load test on the battery?
Ok, let me know.