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IF you spliced (removed the OEM connectors) the wires from the distributor to the MSD box it is possible to have them connected incorrectly.
These wires are routed together in one harness to form the Magnetic
Pickup connector. The connector plugs directly into an MSD
Distributor or Crank Trigger. It will also connect to factory magnetic
pickups or other aftermarket pickups. The Violet wire is positive (+)
and the Green is negative (-). When these wires are used, the White
wire is not.
If the trigger wires are accidently reversed the timing will change dramatically and not allow the engine to run past about 4500rpm. My experience is that if the module within the distributor fails there will be no spark, caused by open circuit. Sometimes this is heat related, but it either allows spark or does not, it's generally not intermittant while running.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 02-17-2008 at 09:51 AM..
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