5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

MSD problem

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Old Dec 3, 2006 | 03:13 AM
  #11  
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I just have it wired in with the TFI adapter. The power leads are hooked to the solenoid. The TFI adapter should act as a plug and play adapter. it connects to the coil and distributor. Very simple there are no "wiring" instructions. Things just connect in the matching slots basically.
Old Dec 3, 2006 | 07:29 AM
  #12  
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So I guess this is how you have it wired.


If what your problem is what I have guessed. You can unhook the red wire from the MSD box from the wire harness. Take a spare wire and jump the connection to the battery. This will just be to test your switched connection. With the red wire jumped to the battery, start the car. If it turns over and starts like it should, then that is the problem. If so, there are two things you can do. (1)Wire a wire from the red wire to a switch mounted in your car cab. Then a wire from the switch to the battery. You will need to switch that switch on and off when you stop and start the car. (2)Take the red wire and wire it to an accessory circuit that does not shut off when you start the car. If you cant do that, take it to some one to do.
Old Dec 3, 2006 | 02:44 PM
  #13  
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Thank-you so much for helping me with this... i will try it and see what I can come up with... You are a life saver
Old Dec 8, 2006 | 11:27 PM
  #14  
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can you give me an example of a good accessory circuit to wire the red wire into?
Or if I use a switch, what amp rating should my switch be for?

Thank-you
Old Dec 9, 2006 | 12:57 AM
  #15  
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Use the circuit your stereo is on. Or use a switch that can handle at least 20amp continuous.
Old Dec 9, 2006 | 01:26 AM
  #16  
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this may be a really stupid question but does anything need to plug into where the red wire was supposed to plug into on the harness? should it just be ignored and left alone?
Old Dec 9, 2006 | 01:28 AM
  #17  
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Leave it alone. But make sure it doesnt touch anything. Tape it closed.
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