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Thunderbolt Iv Wiring Diagram 9. Thunderbolt IV HEI ignition (no spark) 10. Thunderbolt IV HEI ignition test 11. Engine will not crank over 12. Charging system not working correctly 13. Engine runs poorly at idle 14. Engine runs poorly at high RPM 15. Engine acceleration is poor 16. Radio noise 17. Troubleshooting with vacuum gauge 18. Oil pressure 19. Valve cover area 19
Thunderbolt Iv Wiring Diagram Re: Thunderbolt IV wiring question No, there isn't any ground wire from the distributor to ground, the housing is the ground, that is done by clamping down the distributor not with a wire. The amplifier itself is grounded, and on yours is usually on one of the mounting bolts for the amplifier itself where it mounts to the elbow.