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I have a 2006 Mercury 25 EFI and accidentally reversed the

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battary leads . First...
I have a 2006 Mercury 25 EFI and accidentally reversed the battary leads . First symtom was no power to the engine / would not crank. I found a blown fuse in the yellow fuse block on the top starboard side of the engine. Replaced the fuse and the engine started instantly, I shut the engine off quickly ( as the boat was trailered ). Tried 48 hours later to start the boat, excessive cranking, found to be no spark at all 3 spark plugs. any suggestions?
Submitted: 1 year ago.Category: Boat
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Answered in 47 minutes by:
4/27/2016
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3,994
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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Hello Jake, my name is***** will assist you.Do you have the serial number of the engine handy?
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Customer reply replied 1 year ago
Hi Charles OR127491
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Hello again Jake,first thing we need to look at is the fuse to make sure that it is still good, and then the kill switch. Cycle the switch a few times and then try to start the engine again to see if it will go.Let me know what you find out.
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Customer reply replied 1 year ago
Charles, the fuse was blown in the yellow fuse block, already replaced it... Engine cranks but no spark. Engine is not equipped with a kill switch
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Is this a remote set up or tiller?
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Customer reply replied 1 year ago
Remote set up.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Do you not have a dead man switch near the helm on this set up?if not, there should be one on the front of the engine.
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Customer reply replied 1 year ago
Nothing at the helm nothing, nothing at the engine. I followed the wiring diagram and the wires marked kill switch just terminate and are caped off... The only thing on the front of the engine is an oil warning light
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Ok great. How did you test the engine for spark?Are you sure that you are getting fuel pressure?
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Customer reply replied 1 year ago
I tested the old school way by grounding the spark plug to the engine block, doubted myself and borrowed an in line tester that goes from spark plug wire to plug and had a light... No spark. Tank is full, primming bulb stiff, fuel leak when I disconnected the quick connect to engine...
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
On your control box, is there not a switch on it that is red?Can you upload a pic of it here?
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Customer reply replied 1 year ago
By control box you are referring to the throttle control ? If so, then no nothing there. Just a throttle with trim control
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Any pics that you could post here?What boat do you have the engine on?
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Customer reply replied 1 year ago
I'm not home to get the picture. When I get home what do you want the picture of specifically ? I've been around boats for the last 20 years, there's definitely not a kill switch at the helm. I think this is related to the ECU or ECM ( the box with the diagnostic port on it )on the engine, or other electronic related parts. Do you have some experience with this ?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
I have a great deal of experience with this engine. I am a certified Mercury Outboard tech and work on them in real life. It is just odd that it fired for you, then after you stopped it, it would not restart. Do you have a multimeter also?
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Customer reply replied 1 year ago
I have a multimeter
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Ok, set it to a scale around 400V AC, unplug one of the coils. insert the red meter lead to the harness plug and the black meter lead to a good ground. Have a helper crank over the engine and see if you get a voltage reading.
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Customer reply replied 1 year ago
I can give this a try, it might be as late as Monday , I'm traveling for work. Is that ok?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Yes, that is fine. There are no time limits here.
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