1989 Mazda B2600i Not getting ingnition spark.

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Truck would start every time, then just would turn over and we found wasn't getting spark. Was told the Igniter in the Pickup coil was bad, so replaced it and truck ran for two days, then same sympoms. Found that Ignition Coil was bad, so replaced it. Still no spark, replaced spark plug wires and still not getting spark from ignition coil from lead and holding it 1/4" from engine block. I've got 12V on the black w/ white stripe wire going into the ignition coil, but nothing from the white wire. It's not a ground wire. Looking for a wiring diagram or advice.