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Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3929
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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200 hp etec. fuse keeps blowing when i plug i.n the bottom

Customer Question

200 hp etec. fuse keeps blowing when i plug i.n the bottom ecm
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.
Customer: 200 hp keeps blowing fuse when i plug into bottom of ecm
JA: Is there anything else the Marine Mechanic should be aware of?
Customer: no
Submitted: 1 year ago.
Category: Boat
Expert:  Charles replied 1 year ago.

Hello, my name is***** will assist you.

you are going to have either a shorted EMM or there is one of the components that is on that circuit has shorted. Unplug all sensor, injectors, and coils from the harness, then plug in the bottom harness again, if the fuse still blows, the EMM is the fault. If one, plug in one item at a time until the fuse does fail, then replace the last component plugged in.