hello. we hope maybe someone can help with the problem we are having with this 96 mustang v6. originally it wouldnt start. battery replaced, everything was fine for a week or so and then the new battery died. assuming the alternator was not keeping the battery charged, alternator was replaced. Found out a lot later that the battery was defective and so battery was replaced again with another brand new one. Car will not crank. Starter has been checked, battery is brand new, alternator brand new. When key is turned, a noise comes from what looks like a junction box which is located behind the passenger side fender. The fender had to be removed to see this item. Can anyone say what the name of this is and what the noise could be. Battery cables, connections and wires have all been replaced. Cannot figure this out. Any help would be greatly appreciated. Thank you.
96 Mustang Won't Start...Help needed!!!!
- Thread starter CL2018
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Welcome to stangnet, I moved this to the tech threads so you can get some help, I'm a fox guy so I'm not much help, actually I no help at all 
wmburns
SN Certified Technician
Is this a "no crank" or a "crank with no start"?
However given the recent work done, more than likely you have accidentally disconnected the PCM/CCRM ground that goes around the battery. These are large black wires that end at the radiator core support and the battery negative terminal. Sometimes the wires are black with a white stripe. The connector is often a larger single pin round connector.
Regardless. Double check the grounds around the radiator core support. Make sure they are clean and tight. Don't ignore any loose or frayed wires. Corrosion is the enemy.
The thing clicking in the right front passenger's fender well is the CCRM. Likely it's clicking because of a weak battery connection or disconnected ground.
Here's some more information that may help.
1996+ Crank with no start check list
https://www.allfordmustangs.com/forums/4-6l-tech/336452-1997-mustang-wont-ignite.html
If unable to located a bad ground here's some information on how to test.
Howto perform charging system voltage drop test
https://www.stangnet.com/mustang-fo...perform-charging-system-voltage-drop-test.56/
However given the recent work done, more than likely you have accidentally disconnected the PCM/CCRM ground that goes around the battery. These are large black wires that end at the radiator core support and the battery negative terminal. Sometimes the wires are black with a white stripe. The connector is often a larger single pin round connector.
Regardless. Double check the grounds around the radiator core support. Make sure they are clean and tight. Don't ignore any loose or frayed wires. Corrosion is the enemy.
The thing clicking in the right front passenger's fender well is the CCRM. Likely it's clicking because of a weak battery connection or disconnected ground.
Here's some more information that may help.
1996+ Crank with no start check list
https://www.allfordmustangs.com/forums/4-6l-tech/336452-1997-mustang-wont-ignite.html
If unable to located a bad ground here's some information on how to test.
Howto perform charging system voltage drop test
https://www.stangnet.com/mustang-fo...perform-charging-system-voltage-drop-test.56/
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