Made a rookie mistake! I had a no start issue after wiring up my Sniper EFI with a Hyperspark Distributor, Ignition Box, and Coil on my 1970 Mustang with a 351 Cleveland, and I thought it I would post it hoping it might help others who experience a similar issue. I had my Cleveland rebuilt and my engine builder and he installed the EFI set up and ran the engine and then disassembled the EFI components and wiring before I received it. I installed it back in my car and wired the Sniper and Hyperspark components. I wanted to keep the wires neat, so I re-pinned some of the plugs and trim and lengthened some of the wires on everything but the Sniper itself. Before I go any further, let me describe the wire harness for the Hyperspark Distributor... The Distributor harness starts with a three-pin plug for the... 1) Red/Pink 12v ignition, 2) (center) Purple +, and 3) Green - crank wires. On the other end of the harness, the pink 12v is a single loose wire and the green and purple are pinned to the two-pin square plug to connect to the Holley Sniper. In the process of making the wire mods, I noticed that the two-pin square plug for the Positive Purple Crank and Negative Green Crank wires coming from the distributor were reversed (green to purple and purple to green) when plugged into the Sniper two-pin crank plug counterpart. I checked the Holley documentation that I received with all the components and nowhere did it mention that it is normal for the purple and green wires to be reversed when plugged in to the sniper EFI. The complete wiring diagram did not have the wire colors for these two wires. The Holley documentation did say to use the harness that comes with the distributor, but that was all it said. So I thought this must be a manufacturing mistake, and I re-pinned the wires to match purple to purple and green to green. WHAT A MISTAKE! For days I tried to diagnose my "STALLED" problem undoing all my wiring and tearing my hair out in the process. Even with Holley tech's help, we could not figure out why my Sniper was indicating the engine was stalled and was not getting a crank signal. Long story short... I was at a loss and ready to ship the Sniper to Holley for testing under the warranty, when I was going back thru some pictures I had saved and saw a sales picture for the Hyperspark Distributor, and in the picture I noticed that the wire harness shows the purple and green wires were also reversed in the plug. I went back and re-pinned those wires back to purple to green and green to purple and the dam engine started right up! So, DO NOT make the same mistake I made!
Holley should provide a better explanation and tell the installer that these wires are intentionally reversed and do not change them.