Ignition module

[Fisherleep]

I have electronic ignition in my 75 bronco. I am blowing my main 30amp fuse next to the starter motor relay. I have narrowed the short that I think I have to the ignition system with the key in the on position I get 9v to the black wire on the distributor that should be ground right? The box is brand new and is grounded correctly do I have a bad box, is something else creating this or is this correct any help or ideas would be great this is driving me crazy.

 

[Bully Bob]

Yah,

6+ volts on the "pos." side of the coil....not the "neg."

Should see + & - marked on the coil.

Did you try running a seperate ground wire to the neg. side..?

(The orig. one off of course)

If there's still voltage on the neg. side then it may be a bad coil...

 

[Fisherleep]

I know the coil is good it is a brand new MSD the problem is between the distributor and modual (stock) black wire is getting 9v but thought that was ground The purple and orange are fine

Yah,

6+ volts on the "pos." side of the coil....not the "neg."

Should see + & - marked on the coil.

Did you try running a seperate ground wire to the neg. side..?

(The orig. one off of course)

If there's still voltage on the neg. side then it may be a bad coil...

 

[Bully Bob]

Tough to diagnose with eyeballs on let alone electronically....

Sounds like you need a diagram, or someone (shop) with electronics knowledge to verify your correct hook-up.