2003 Ford Focus 2.3L?
Slow to start or turn over; like it's not getting power to the starter. Replaced starter and battery strong. Ideas why starting sounds to be labored? Short term problem so maybe something easy as a wire shorting or something got unplugged? Relay going out? Makes connection to starter, but turns like there isn't enough power.
Around 2003, Ford tried a 'sheet metal' battery cable clamp to replace the more expensive solid lead clamps - they didn't work. If you have the 'sheet metal' kind still, they have to be replaced with the old fashioned solid lead kid.
Try hooking one jumper cable from the battery ground post to the engine. If it turns faster, something is wrong with the engine to chassis ground.
"And battery strong". Assuming will always get you in trouble. Get the battery charged AND load tested. Replace if it fails the load test.
Battery checks ok (or replaced) and issue does not go away, check for power at the starter solenoid terminal with a 12V incandescent test light (test light connected to battery negative) at the terminal with the battery cable connected while cranking. Test light SHOULD light with a very bright light. Check for starter ground at the starter body with the test light connected to battery negative. Test light SHOULD NOT light.
Test light is not lit or has weak light at the battery terminal of the starter, check for a voltage drop at the battery cable. Check for voltage at the battery terminal of starter solenoid and positive post of the battery while cranking. Voltage is 0.3V or over, replace the battery terminals. Check for damage at the battery cable or a bad fusible link if there's one.
Starter ground is weak, check the battery negative cable and connections.
Is the battery the correct size CCA rating?
Have you cleaned the battery posts and inner area of the cable clamps so they are shiny?
The battery cables themselves can become internally corroded and case too much resistance. Take the negative cable off of the motor where it grounds and clean the cable end and motor surface.
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