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I have a 1988 mercury mariner 75hp that when i hit the key…

Customer Question
i have a 1988 mercury...
i have a 1988 mercury mariner 75hp that when i hit the key to start sometimes it will turn over and u walk away and the next time it wont make any sound?
Submitted: 10 months ago.Category: Marine Electronics
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Answered in 1 minute by:
10/16/2017
Marine Electronics Expert: Jason, Marine Mechanic replied 10 months ago
Jason
Jason, Marine Mechanic
Category: Marine Electronics
Satisfied Customers: 18,223
Experience: Degree in Marine Technology, Also Certified with Mercury Marine, MCM, MIE, VP, Yamaha, Honda, Suzuki
Verified

Hello my name is ***** ***** am I speaking with? I read what you wrote. I don't see any kinds of questions. Did you need an explaination of how the starting system works, or a wiring diagram, or did you have different questions on the issue?

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Customer reply replied 10 months ago
right now when i turn the key to start it it makes no sound,
Customer reply replied 10 months ago
this is brad,
Marine Electronics Expert: Jason, Marine Mechanic replied 10 months ago

Hi Brad. Okay got that. Do you have a volt meter, now how to take voltage measurments, and are you near the boat now?

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Customer reply replied 10 months ago
im not with the boat, i took my volt meter to the red wire and then the black with yellow to check there and it was low, like 10.54
Marine Electronics Expert: Jason, Marine Mechanic replied 10 months ago

How is it I can be of help to you, what are you looking to do here?

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Customer reply replied 10 months ago
im wanting to get my boat motor to start, wondering why u can hit the key a couple times and it turns over and then try it 3 more times and no sound at all
Marine Electronics Expert: Jason, Marine Mechanic replied 10 months ago

I get all that. You could have a bad key switch, a bad battery connection, a neutral switch problem, and a host of other things. Would it help if I explained how the starting system works, and how voltage gets from point A to point B?

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Customer reply replied 10 months ago
that would be great, the control is brand new,
Marine Electronics Expert: Tan, MerCruiser Certified Technician replied 10 months ago
Tan
Tan, MerCruiser Certified Technician
Category: Marine Electronics
Satisfied Customers: 11,422
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
Verified

Hello Brad. My name is Tan.

Since the control is brand new that leaves the start solenoid or a battery cable connection as the issue.

We need to test when the problem occurs. Check for voltage on the red/yellow wire when the key is in the crank position. If you have voltage and the engine does nothing the solenoid is bad. If you have no voltage or voltage below 9.5 then we have a battery cable issue. Right now everything points to a start solenoid as the issue.

Does this make sense?

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Customer reply replied 10 months ago
sir
Marine Electronics Expert: Tan, MerCruiser Certified Technician replied 10 months ago

Keep me posted to your findings or post back if you have a question on troubleshooting.

I hope I’ve provided the information you were seeking. If you are happy with my service, your 5-star rating at this time is most welcome. If you need more help, please let me know so l can continue to assist you.

Thank you.....Tan

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Tan
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Tan, MerCruiser Certified Technician
Category: Marine Electronics
Satisfied Customers: 11,422
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Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

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