Claudius
Well-Known Member
When the rebuilt engine was put into my '68 Barracuda, the original harness was still in place and it was adapted by the mechanic to work with the MSD 6425 CD ignition box.
I carefully removed the front and under dash harnesses as part of a complete replacement of the car's wiring. The kit I am working with is the American Autowire 510603, specifically for Mopar A-bodies.
Long story short, the engine cranks perfectly but there is zero spark at the plugs. I have done the following:
1) Verified that +12V is feeding the ignition box when the key is turned to the ON position. The heavy red and black wires from the ignition box are tied directly to the battery terminals.
2) Cleaned up the ground cable interface points on the block and where they connect onto the body.
3) Performed a successful spark test of the coil as per the troubleshooting instructions of the MSD ignition box. (I am using the two purple and green wire pair that connects to the +/- terminals of the MSD coil.) This seems to indicate that the coil is good.
4) I tried replacing the magnetic pickup in the distributor (Summit Racing 850027) because an ohm meter measurement and conversation with Summit tech suggested that the resistance was out of specification. The resistance has not changed.
There is no spark from any of the plugs when I crank the engine. Any suggestions? I am certain the 6425 box is fine because its red light blinks as per specification when power is applied to it from the key.
Any input or suggestions are appreciated, whether in the forum or by PM.
I carefully removed the front and under dash harnesses as part of a complete replacement of the car's wiring. The kit I am working with is the American Autowire 510603, specifically for Mopar A-bodies.
Long story short, the engine cranks perfectly but there is zero spark at the plugs. I have done the following:
1) Verified that +12V is feeding the ignition box when the key is turned to the ON position. The heavy red and black wires from the ignition box are tied directly to the battery terminals.
2) Cleaned up the ground cable interface points on the block and where they connect onto the body.
3) Performed a successful spark test of the coil as per the troubleshooting instructions of the MSD ignition box. (I am using the two purple and green wire pair that connects to the +/- terminals of the MSD coil.) This seems to indicate that the coil is good.
4) I tried replacing the magnetic pickup in the distributor (Summit Racing 850027) because an ohm meter measurement and conversation with Summit tech suggested that the resistance was out of specification. The resistance has not changed.
There is no spark from any of the plugs when I crank the engine. Any suggestions? I am certain the 6425 box is fine because its red light blinks as per specification when power is applied to it from the key.
Any input or suggestions are appreciated, whether in the forum or by PM.
