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Author Topic:   Mustang hot coil
jimshar
Dirt Full Roller

Total posts: 67
posted May 08, 2005 04:15 AM  
I have a 81 mustang 2.3. For some reason the coil gets real hot and the module keeps burning out. we have gone over the wiring a half dozen times and cant figure out why. we have a stock module (blue box type) msd coil, start button with on/off switch(speedway motors) and a on/off switch for the battery. it must be something in the wiring. has anyone had this problem? any help would be good.

bigphillb
Dirt Roller

Total posts: 19
posted May 08, 2005 12:51 PM  
Do you have a resistor on your coil? If not get one. Go to MSD's web site they may have a wiring diagram, if not it's just hooked up in-line to the coil's + side to limit current to the coil. You can pick them up at the parts store cheap.

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racing at the speed of life

jimshar
Dirt Full Roller

Total posts: 67
posted May 08, 2005 01:35 PM  
I dont have a resistor on it but i will get one. Will not having the resistor make the module fail? Thanks
quote:
Originally posted by bigphillb:
Do you have a resistor on your coil? If not get one. Go to MSD's web site they may have a wiring diagram, if not it's just hooked up in-line to the coil's + side to limit current to the coil. You can pick them up at the parts store cheap.



racerman707
Dirt Freak

Total posts: 374
posted May 08, 2005 02:19 PM  
Have you ever tried the tfi dist. w/ the module on the side?

jimshar
Dirt Full Roller

Total posts: 67
posted May 08, 2005 03:00 PM  
I havent tried that. When I say module, its a box thats about 6"x6" with all the wires and the blue end. if the resistor doesnt work I might have to try the new dist.
quote:
Originally posted by racerman707:
Have you ever tried the tfi dist. w/ the module on the side?


bigphillb
Dirt Roller

Total posts: 19
posted May 09, 2005 11:46 AM  
If you can I would run a msd box. Can get one at any race shop. We found that Autozone is as cheap as any.

jimshar
Dirt Full Roller

Total posts: 67
posted May 09, 2005 03:09 PM  
What would be making the box burn out though? I need to fix this first.Could not using a resister be the problem? Bad ground?
quote:
Originally posted by bigphillb:
If you can I would run a msd box. Can get one at any race shop. We found that Autozone is as cheap as any.


bigphillb
Dirt Roller

Total posts: 19
posted May 09, 2005 03:40 PM  
If the coil is drawing too much current through the box then yes it may take it out. how much is it to replace? A MSD box shouldn't be more than $125-$150. We found it was worth it with less problems and easy wiring.

jimshar
Dirt Full Roller

Total posts: 67
posted May 10, 2005 04:04 AM  
The stock box is $30. Put a resistor on last night and so far so good.
quote:
Originally posted by bigphillb:
If the coil is drawing too much current through the box then yes it may take it out. how much is it to replace? A MSD box shouldn't be more than $125-$150. We found it was worth it with less problems and easy wiring.


bigcityracer
Dirt Freak

Total posts: 431
posted May 12, 2005 01:39 PM  
YOU CAN DISCONNECT THE ALTENATOR AND LEAVE THE RESISTOR AT HOME.

quote:
Originally posted by jimshar:
The stock box is $30. Put a resistor on last night and so far so good.


13dad
Dirt Roller

Total posts: 7
posted May 16, 2005 08:04 PM  
Throw away all that stock box and get a GM module. You will be happier and never have another ignition problem.

jimshar
Dirt Full Roller

Total posts: 67
posted May 17, 2005 09:02 AM  
will the GM wire up the same as the ford? can you give me some more info on the GM box? Like what box out of what car? Thanks
quote:
Originally posted by 13dad:
Throw away all that stock box and get a GM module. You will be happier and never have another ignition problem.


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