Ford 460 ignition trouble

[Dark Cloud]

I aquired a Tahiti jet w/Ford 460 that blows fuse as soon as key is turned to IGN. I found that if I isloate point contacts with paper fuse does not blow. Ignition is Mallory dual point w/stock coil, ballist resistor. Any thoughts on what is causing this?

[gfinch]

First what amp fuse is it? The points are the end of the line so to speak. Power runs through every thing , ballist resistor to coil then to ground through the points. I would think if it has the correct fuse then one of the components, coil or resister is shorted internally.

[elbowcarey]

When you turn the key you are completeing the circuit, so if the fuse is blowing I would say that you have a dead short...... Check continuity between all points with a fluke to find the problem area then disconect it from the electrical path and jumper that area with temp wires across to re-check ignition switch to verify the problem.... Trace all of your wires too and check for nicks that could be in contact of metal/ground.

[Dark Cloud]

Thanks, seems both the coil and the ballest resistor were shorted internally. Boat runs great. Pic attached