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- Page 27: Ignition Timing SERVICE MANUAL NUMBER 25 MAINTENANCE 7. While holding adjustment stud at the correct belt tension, tighten 5/8 in. Run engine for a short period of time and recheck belt adjustment. 74908 5/8 in. Locking Nut 5/16 in. Adjusting Stud Ignition Timing Thunderbolt V Models 1. Page 28: Efi.
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Mercruiser Sterndrive 5.0 MPI Pdf User Manuals. View online or download Mercruiser Sterndrive 5.0 MPI User Manual. Thunderbolt V Ignition. Force unleashed 2 lightsaber colors.
Need an Owner’s Manual for your Mercury Engine to perform maintenance, replace parts or just learn more about your engine? Mercury has made it easy for you to receive a free printed copy or to download and print your own copy. To order a printed version of the Service Manual for your particular Mercury Outboard or MerCruiser Engine, click here. V6 and V8 Carbureted Models (Thunderbolt V Ignition) 1. Connect timing light (91-99379 or similar) to No. 1 spark plug wire. Connect power supply leads, if applicable, on light to 12 volt battery. Refer to Specifications – “Engine Rotation and Firing Order” for cylinder numbering and location. Connect a shop tachometer to engine.
Thunderbolt IV mounted on exhaust elbow wht/red from module to dis. to module. purple on pos.
coil from module and kill switch /ignition. blk.
Thunderbolt IV is a battery powered High Energy Ignition system, not a CD system. The Sensor (a device that acts like a switch when subjected to a magnetic field) Wiring Harness,.
![Ignition Ignition](https://s3-us-west-2.amazonaws.com/usedphotosna/47655434_934.jpg)
Battery Cables,. Key Switch.
Replace. Ignition. Sensor in.
thunderbolt iv mounted on exhaust elbow wht red from module to dis wht grn from moreover mercruiser boat wiring diagrams along with yamaha marine thunderbolt iv ignition wiring diagram the best boat forum for answers to hard. thunderbolt iv mounted on exhaust elbow wht red from module to dis wht grn from moreover mercruiser boat wiring diagrams along with yamaha marine thunderbolt iv ignition wiring diagram the best boat forum for answers to hard.
Thunderbolt IV is a battery powered High Energy Ignition system, not a CD system. The Sensor (a device that acts like a switch when subjected to a magnetic field) Wiring Harness,.
Battery Cables,. Key Switch. Replace. Photograv crack.
Ignition. Sensor in.The best boat forum for marine electrics and marine electronics for technical advice and answers.
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IGNITION SYSTEM - 4B-1 Thunderbolt IV (HEI) Ignition System a - Ignition Module a Special Tools MERCURY MARINE SPECIAL .WIRING HARNESS & ELECTRICAL COMPONENTS(THUNDERBOLT IV IGN.) | schematron.orgThe best boat forum for answers to hard qustions about boats
Models Affected
All MerCruiser models with Thunderbolt IV ignition systems.
Situation
Replacement Thunderbolt IV ignition control modules (ICMs) no longer come with the adapter harness (15275A1). This adapter harness was required when replacing an original Thunderbolt IV ICM with a second‑generation Thunderbolt IV ICM. Second‑generation Thunderbolt IV ICMs are still available (without the adapter harness).
Correction
New module and harness kits are available as service replacement parts for the original Thunderbolt IV ICM. Engines with second‑generation Thunderbolt IV ICMs that have a damaged harness will also require the new ICM and harness kit.
Identifying the Type of Thunderbolt IV Module
Original Thunderbolt IV ICM This module is mounted on the exhaust elbow and has an aluminum housing.
Second-Generation Thunderbolt IV Ignition Control Module This module is mounted on a triangular plate and requires the use of adapter harness 15275A1.
IMPORTANT: Adapter harness (15275A1) is no longer available from the manufacturer. If this harness is damaged and needs to be replaced, a new ignition control module and harness kit must be ordered.
Ordering Replacement Modules and Module Harness Kits
Use the engine serial number and the MerCruiser Electronic Parts Catalog to determine the appropriate ICM or ICM harness adapter kit for your engine.
Use the engine serial number and the MerCruiser Electronic Parts Catalog to determine the appropriate ICM or ICM harness adapter kit for your engine.
Engine | Stamp on Module | Previous Thunderbolt IV ICM Kit | Second‑Generation Thunderbolt IV ICM (without adapter harness) | Replacement ICM Conversion Kit (includes harness adapter) |
1987-1993MCM 4.3L Engines | V6-14 | 15247A1 | 15247T01 | 15247T02 |
5.0L, 5.7L & 7.4L Engines | V8-24 | 15248A1 | 15248T01 | 15248T02 |
5.0L & 5.7L Engines | V8-22 | 15899A1 | 15899T01 | 15899T02 |
5.7L & 525 SC | V8-22A | 814295A1 | 15899T01 | 15899T02 |
5.7L Engines | V8-24S | 821125A1 | 821125T01 | 821125T02 |
502 Mag, 8.2L, 600SC & 800SC | V8 20R | 817509T | 817509T | 817509A10 |
Mercruiser Thunderbolt Ignition Manual Transmission
Tags: ICM, Mercruiser ignition module, Thunderbolt