Starting problems

[astr05oh]

I have a 2014 Mustang Gt and recently my car has had trouble starting after sitting for 7+ hours. I’ve had the battery, alternator, and charging system tested and it said everything was in good shape and shouldn’t be the problem. I then moved onto the starter relay and had the same problem. I replaced the starter and the same thing. I ran my car for codes and it said I had a problem with the abs module for a bad ground but I thought it was unrelated. Could the bad ground be causing my starting problems? If so where’s the ABS module ground?

 

[DieHarder]

I have a 2014 Mustang Gt and recently my car has had trouble starting after sitting for 7+ hours. I’ve had the battery, alternator, and charging system tested and it said everything was in good shape and shouldn’t be the problem. I then moved onto the starter relay and had the same problem. I replaced the starter and the same thing. I ran my car for codes and it said I had a problem with the abs module for a bad ground but I thought it was unrelated. Could the bad ground be causing my starting problems? If so where’s the ABS module ground?

Have you or anyone touched the car prior to the problem showing up? If so, what did you work on? If not, maybe you have a ground issue.

Yes, bad grounds can definitely cause starter problems (and all kinds of mayhem). First, determine the charge in the battery. If you don't have one recommend getting a battery charger/conditioner. Charge up the battery. Once you get it started record the battery voltage. Should be 14.2 - 14.7 vdc across the battery terminals. Then, disconnect and clean all of the major grounds you can get to. To eliminate any ground issues between the frame and engine run a 4 gauge wire from the ground on the passenger strut tower and connect it to a mounting bolt for the alternator. That will ensure ground at the alternator is at the same reference as ground at the frame.

For more information see: Finally found the cause of my low voltage - Beware the all important grounds.