Thunderbolt 4 Ignition Wiring Diagram

This is a complete working ignition system that was removed from a gm v 8 engine with the thunderbolt 4 ignition system.

Thunderbolt 4 ignition wiring diagram. How do i troubleshoot my thunderbolt ignition. Second generation thunderbolt iv ignition control module this module is mounted on a triangular plate and requires the use of adapter harness 15275a1. Remove the whitegreen lead from the dist. I had a slight stumble on acceleration and i had previously changed the spark plugs ignition module ohmed the spark plug wires changed to another known good coil fuel filter and disassembled.

Here is the youtube location to where the system is being offered for sale. It should read 12 volts. If 12 volts is present remove the coil spark wire from the distributor and connect it to a spark gap tester to ground. Spark plug gap in.

4b on your mercruiser are designed and manufac tured tothunderbolt v ignition wiring diagram together with subaru robin parts diagrams further wiring harness electrical thunderbolt v ignition also moreover mercruiser thunderbolt 4 wiring diagram also mercruiser wiring diagram moreover mercruiser wiring diagram along with cruiser 5 7 thunderbolt. 4b troubleshooting thunderbolt v ignition. Connect your voltmeter neg. The tb iv system was used until the introduction of tb v mid way through 1996.

Testing thunderbolt iv hei ignition system. One has the large thunderbolt ignition module the other does have the. Spark plug type. Thunderbolt v was an improvement on an already exceptionally reliable and well performing system.

Tests for tb ignition. Mercruiser thunderbolt ignition systems. Thunderbolt iv ignition wiring diagram wiring diagram is a simplified standard pictorial representation of an electrical circuitit shows the components of the circuit as simplified shapes and the capacity and signal connections between the devices. Mercruiser introduced the thunderbolt iv onto their engines in 1982 alongside the introduction of the 1 r drives.

Electrical ignition and fuel system components on your mercruiser power package. Refer to the circuit wiring diagram on the following page for reference to this. Wignition key on and bilge well ventilated of gas fumes. Mercury marine service bulletin 92 11.

Thunderbolt v ignition system. Lead to the whitered wire terminal at the dist. Identifying the type of thunderbolt iv module original thunderbolt iv icm this module is mounted on the exhaust elbow and has an aluminum housing. Do not use a test light.

Thunderbolt iv wiring question no there isnt 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. Use a voltmeter when making these tests.