Very simple:
Electricity needs to go from battery to ignition switch to starter button to solenoid magnet.
And from battery to solenoid contact to starter.
The screwdriver has proven function of the second circuit.
Take your test lamp and check if you have power at your ignition switch.
Then check for power at the starter button.
Then check if you get anything through to the solenoid mangnet.
Once you realised that it's sometimes better to put the friggin' beeping and flashing diode testing multimeter away and use grandpa's tools you will find the culprit witin five minutes.
Have fun!
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