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. 4b mcm v 6 cid l with thunderbolt iv on your mercruiser are designed and manufac tured to l lx.
Wiring Harness Amp Electrical Components Thunderbolt Iv Ign
Thunderbolt iv wiring diagram. It shows the components of the circuit as simplified shapes and the capacity and signal connections between the devices. Adapter harness 15275a1 is no longer available from the manufacturer. Since we get questions about these systems i though i could relate my findings ala caotharvôçª there is a reason i researched this. After cooling it runs normal. Tests for tb ignition. Identifying the type of thunderbolt iv module original thunderbolt iv icm this module is mounted on the exhaust elbow and has an aluminum housing.
Wanted to replace the mercruiser ignition system with something new. Fits gm v 6 engines with thunderbolt iv v hei ignition. Lead to the whitered wire terminal at the dist. Remove the whitegreen lead from the dist. Connect your voltmeter neg. 4b ignition system wiring diagram.
Wiring diagrams 4f 3 thunderbolt iv with ignition module mounted on. It should read 12 volts. When hot the ignition fails completely. If 12 volts is present remove the coil spark wire from the distributor and connect it to a spark gap tester to ground. Jun 19 need wiring schematic for mercruiser. Lead to the engine ground and pos.
Thunderbolt iv and v ignition systems. Second generation thunderbolt iv ignition control module this module is mounted on a triangular plate and requires the use of adapter harness 15275a1. Whtgrn from module to dis. Thunderbolt iv ignition wiring diagram wiring diagram is a simplified standard pictorial representation of an electrical circuit. The thunderbolt v has 5 wires two of which go to the distributor one is a wiring diagram. Wignition key on and bilge well ventilated of gas fumes.
My 2452 with a 57l 250 hp 2 bbl carb engine had developed a problem. Thunderbolt v ignition wo knock sensor. 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. 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. Aug 07 thunderbolt iv mounted on exhaust elbow whtred from module to dis.
Gallery of Thunderbolt Iv Wiring Diagram
