Mercury Distributor Cap & Rotor Kit 815407T5

Mercury MerCruiser Quicksilver 815407T5 is a genuine OEM distributor cap and rotor kit for GM V6 MerCruiser engines using Thunderbolt IV and Thunderbolt V HEI ignition systems. Current Mercury parts sources and major OEM-focused retailers consistently identify this kit as the correct cap-and-rotor service set for this ignition family.

Key Features

• Genuine Mercury MerCruiser Quicksilver OEM kit
• Distributor cap and rotor kit
• Designed for GM V6 MerCruiser applications
• For Thunderbolt IV and Thunderbolt V HEI ignition systems
• Commonly described with brass rotor / RFI-resistant ignition design in current listings
• Service replacement for worn cap-and-rotor ignition components.

Engine Compatibility
Common current listings describe 815407T5 for GM V6 MerCruiser engines with Thunderbolt IV and V HEI ignition. Several sources specifically tie it to 4.3L V6 MerCruiser applications, including 1985-up references in aftermarket fitment listings. Fitment should still be confirmed by engine model, serial number, and installed distributor setup before ordering.

Serial Number Fitment Notice
Fitment should be confirmed by MerCruiser engine serial number and ignition configuration, not by engine family alone. The safest match is by OEM part number 815407T5 and the installed Thunderbolt IV / V HEI distributor application.

When This Part Needs Replacement
Replace when the distributor cap shows carbon tracking, terminal corrosion, cracking, or moisture intrusion, or when the rotor shows burning, wear, looseness, or inconsistent spark transfer. Cap-and-rotor wear can lead to hard starting, rough running, and ignition misfire.

Installation Notes
Install only on the correct GM V6 Thunderbolt IV / V HEI distributor application. Confirm the replacement matches the removed cap and rotor before installation. Several current replacement listings also note overlap with older Mercury number 815407Q5, but distributor and engine match should still be confirmed before ordering.

Alternate / Superseded Part Numbers

• 815407T5
• 815407Q5
• 13753A2
• 815407A2
• 11108A3
• 815407Q02
• Sierra 18-5274
• GLM 71790.

Parts Desk Insight
The key match point on 815407T5 is the ignition family. This kit is consistently tied to the GM V6 Thunderbolt IV / V HEI setup, which helps separate it from Delco EST and V8 cap-and-rotor kits that can look similar but do not interchange.

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