Wiring diagrams 4f 3 thunderbolt iv with ignition module mounted on. Aug 07 thunderbolt iv mounted on exhaust elbow whtred from module to dis.
72 Chevy 350 Ignition Wiring Diagram Wiring Diagram
Thunderbolt iv wiring diagram. Identifying the type of thunderbolt iv module original thunderbolt iv icm this module is mounted on the exhaust elbow and has an aluminum housing. Whtgrn from module to dis. Fits gm v 6 engines with thunderbolt iv v hei ignition. It should read 12 volts. 4b ignition system wiring diagram. My 2452 with a 57l 250 hp 2 bbl carb engine had developed a problem.
Since we get questions about these systems i though i could relate my findings ala caotharvôçª there is a reason i researched this. See application fits and newer mcmmie l l l l mpi engines with ecm fits gm v 6 engines with thunderbolt iv v hei ignition. If 12 volts is present remove the coil spark wire from the distributor and connect it to a spark gap tester to ground. Tests for tb ignition. 4b mcm v 6 cid l with thunderbolt iv on your mercruiser are designed and manufac tured to l lx. Second generation thunderbolt iv ignition control module this module is mounted on a triangular plate and requires the use of adapter harness 15275a1.
Jun 19 need wiring schematic for mercruiser. After cooling it runs normal. Thunderbolt iv ignition wiring diagram wiring diagram is a simplified standard pictorial representation of an electrical circuit. Lead to the whitered wire terminal at the dist. Wignition key on and bilge well ventilated of gas fumes. Wanted to replace the mercruiser ignition system with something new.
Lead to the engine ground and pos. Thunderbolt iv and v ignition systems. The thunderbolt v has 5 wires two of which go to the distributor one is a wiring diagram. It shows the components of the circuit as simplified shapes and the capacity and signal connections between the devices. Connect your voltmeter neg. Thunderbolt v ignition wo knock sensor.
Remove the whitegreen lead from the dist. Adapter harness 15275a1 is no longer available from the manufacturer. V6 mercruiser engine thunderbolt iv ignition and forgot how all the wires i have the full seloc manual so i already have these wiring diagram that you. When hot the ignition fails completely. L grounding the purple wire does not disable the electronic advance like answered by a verified marine mechanic we use cookies to give you the best possible experience on our website.
Gallery of Thunderbolt Iv Wiring Diagram
