Michigan Motorsports LS1/LS6 Ignition Coil Harness -Stock Location – Fits D580 Coils – Replaces GM #12558948 – Compatible with LS Engines Using Factory-Style Coil Brackets

Price: $42.99
(as of Nov 09, 2025 04:22:42 UTC – Details)

Restore factory performance or complete your LS swap with this LS1 / LS6 Ignition Coil Harness designed for D580 coils in stock bracket locations. This harness is a direct replacement for GM part #12558948, making it the go-to solution for repairing a damaged harness or wiring up your LS engine using OEM-style ignition components. Engineered to work with LS1 and LS6 intake manifolds, this harness maintains factory-correct routing, plug spacing, and coil connector placement. It’s perfect for OEM restorations, swap projects, or servicing an aging LS1-based platform where ignition signal loss or coil issues can stem from worn harnesses. Whether you’re replacing brittle wiring or building a clean swap setup, this plug-and-play harness eliminates headaches and delivers OEM-style reliability you can count on.
Package Dimensions ‏ : ‎ 9.02 x 7.6 x 2.09 inches; 7.34 ounces
Item model number ‏ : ‎ G5400
Date First Available ‏ : ‎ August 30, 2015
Manufacturer ‏ : ‎ Michigan Motorsports
ASIN ‏ : ‎ B0BVTBT2BH
Best Sellers Rank: #97,288 in Automotive (See Top 100 in Automotive) #239 in Automotive Replacement Ignition Coils
Customer Reviews: 4.3 4.3 out of 5 stars 32 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });

Direct Replacement Coil Harness – Designed for LS1 and LS6 engines using D580 ignition coils, this harness restores proper coil function in stock-style coil bracket locations.
Replaces GM Part #12558948 – Offers OEM fitment and plug-and-play installation, making it ideal for factory replacements, harness repairs, or LS swap applications.
Designed for Stock Coil Mounting – Built to match original factory routing and plug positions, ensuring a clean, no-modification install on LS1/LS6 intake manifolds.
High-Quality Connectors and Wiring – Features heat-resistant wiring and factory-style terminals, providing long-term reliability and consistent ignition signal delivery.
Ideal for LS Rebuilds or Coil Harness Repair – Perfect for replacing cracked, frayed, or corroded ignition harnesses without rewiring the full engine harness.