put new plugs and coils in my 2003 f150 5.4 supercharged then started it up and pulled it up on the ramps to change the oil. After the oil change it wouldnt start back only clicks once at the solenoid. Changed solenoid still only clicks one time. took volt meter checked voltage on battery, solenoid, starter key switch everything i could yhink of and all was good. took starter off and checked it and it wasnt wanting ti engage so bought new starter and it started right up then wouldnt start back only click once so i pulled the new starter and checked it and it was only spinning not pushing the gears out so i took it back and got another brand new starter and it started right up again then i turned it off and tried to start back and it only clicks one time dont know whats the problem
Measure voltage at the battery when attempting to crank it. If it goes below 10 volts the battery is bad.
thanks i tried that and drops just under 12 volts while trying to crank.
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