LS1 Ignition Coil

LS1 Ignition Coil



Haltech Part Number HT-020102

The LS1 ignition coil is a high output inductive coil with an internal igniter module.  These were found on most General Motors LS1 Gen 3 engines and are commonly used in the aftermarket.
it requires a unique spark plug lead connection that incorporate a ferrule.  Without the correct spark plug lead connection it is possible for the spark to arc to the coil mount body section  of the coil near the spark discharge post.



Haltech Elite Series Setting
Ignition Mode
Installation Dependent
Ignition Edge
Ignition Dwell Mode
Constant Charge





12V Power Supply

The LS1 coil can draw up to 10A.  If high rpm and high power is being used, together with conventional 30A Relays to provide power, it may be necessary to have a separate fuse and relay for every pair of coils.  This is rare but it is possible.

If the wiring is also not cable of supplying the current required it can also limit the spark output.


The number of grounds (2x) on this coil often cause confusion.  If in doubt, all grounds can be joined together and run the to cylinder head.  This can eliminate issues if there is a poor engine ground strap that then pushes high current through the coil.  It can also prevent a coil from firing if the engine grounding is not sufficient, and this happens as the ground lifts on the ECU signal preventing triggering. The fix is of course to improve the engine grounding. 

Ground Pin A should go to the Cylinder Head and is the return path for the spark
Ground Pin B should go to the ECU Signal Ground and is used as a reference for the ECU Ignition Output.

ICE Ignition Variant

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