How do I troubleshoot the starter solenoid and starter?

Tiny
GLORIA TICE
  • MEMBER
  • 2006 FORD MUSTANG
  • 4.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
I have a new battery and my car gets power but won't start. I don't want to have to buy a starter if I can help it.
Monday, September 5th, 2022 AT 7:28 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

If you suspect the starter could be an issue, do this. I attached the wiring schematic for the starter circuit below, so you have a reference.

First, see if it will start in neutral. If it does, the neutral safety switch is the first suspect. If there is no change, I need you to check the two fuses I highlighted below. In addition to checking the fuses, confirm there is power to and from them.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If they are good, remove the starter relay and switch it with a different one in the box having the same part number. If there isn't one, here is a link that explains how to test one:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

If that tests good, I need you to get a helper. At the starter, there will be a heavy gauge red wire that has battery voltage at all times. Be careful not to short it. Additionally, there will be a smaller gauge wire. It is yellow with a light blue tracer on it. Have a helper turn the key to the start position. If that yellow/light blue wire gets power when the key is in the start position, the starter is the likely issue.

Also, here is a link you may find helpful:

https://www.2carpros.com/articles/starter-not-working-repair

Let me know if this helps or if you have other questions.

Take care.

Joe

See pics below.
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Monday, September 5th, 2022 AT 9:38 PM

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