What are the causes for slow cranking in starter motor?
Possible causes are a degraded or defective battery, faulty electrical connection, a charging system problem, a bad starter or battery rundown when parked. Sudden and unanticipated battery failures can also occur. A dirty battery terminal connection can also cause slow cranking and behave unpredictably.
Can a bad ground cause slow cranking?
A slow cranking starter or no crank at all may be caused by a faulty ground that prevents full voltage to the starter motor.
How do I test a slow starter?
STEP 2 – Perform a voltage drop test: Once batteries pass muster, then perform a voltage drop test on the starter main cables. The starter voltage drop should be less than . 5V drop total on cranking circuit. This is an important step and is often the cause of a slow cranking complaint.
What does it mean when your car starter is slow cranking?
Slow Cranking: For the starter to be cranking, the control circuit would have to be working. So, if battery and cable checks are within specification and the vehicle still cranks slowly, then it’s a slow cranking problem and it’s time to replace the starter.
How to diagnose starter cranking problems Step 5?
Step 5: Voltage drop can often be the cause of slow cranking. However, it can also be a root cause of a click or no-click problem, because of how almost every manufacturer wires the heavy positive post to supply power to the control circuit. Combined with what you know about the problem, these checks should give you an idea of how to proceed.
When is it time to replace a car starter?
So, if battery and cable checks are within specification and the vehicle still cranks slowly, then it’s a slow cranking problem and it’s time to replace the starter. Click No-Crank: Check the control circuit.
Why do I have a slow Crank Crank?
One of your cables may be bad causing the slow crank condition. If the battery is weak then you may get the problem one time and a sudden burst the next. If you battery is more than a couple years old I’d suggest having it load tested to see if it is bad or if is a cable problem.