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Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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25 hp mercury not firing no spark

Customer Question

25 hp mercury not firing no spark
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.
Hello. My name is***** will be assisting you. Could I get the engine serial number please? Have you disconnected the engine stop switch or key switch black/yellow wire? Is this a tiller model or electric start with remote control?
Customer: replied 1 year ago.
Hi Tan my name is***** model is(###) ###-####I have disconnected the engine stop switch
I is a tiller model
Expert:  Tan replied 1 year ago.
Disconnect the black/yellow wire from the switch box does spark return?Do you have a ohm meter?We need to test the charge coil and the trigger.
Customer: replied 1 year ago.
I disconnted te wires and no fire
no but I can get one to-morrow
Can I log on to you to-morrow?
Expert:  Tan replied 1 year ago.
Ok that fine.
Customer: replied 1 year ago.
Talk to you to-morrow
Expert:  Tan replied 1 year ago.
Ok
Customer: replied 1 year ago.
Hi Tan
I have an ohm meter
Customer: replied 1 year ago.
I have removed the fly wheel and cleaned contacts
They looked good
Expert:  Tan replied 1 year ago.
Ok we need to disconnect the wires coming from the stator under the flywheel. Test the black/yellow with the ohm meter to a ground. Then test the black/white to ground. This will be connecting the red meter lead to the blk/yel and the black meter lead to engine ground what does the meter read. Do the same test with the blk/wht. The blk/yel should read 3250-3650 the blk/wht 150-250 ohms.
Customer: replied 1 year ago.
ok going to do that now
Expert:  Tan replied 1 year ago.
Ok if it tests good check the trigger wires test between the brown/yellow to brown/white the spec is(###) ###-####ohms.
Customer: replied 1 year ago.
II have never used an ohm meter before and I don't know where to set it
Expert:  Tan replied 1 year ago.
I have no idea what meter you have an they all work differently. Do you have instruction with your meter? I can't teach you how to use your meter over the internet. Go online and see if you can get instruction on how to use youe meter oif you don't have the instructions.
Customer: replied 1 year ago.
ok
Expert:  Tan replied 1 year ago.
Keep me posted.

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