'94 Mercury 90 HP outboard won't start

Kekoa

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Joined
May 28, 2009
Messages
4
I have a 1994 Mercury 90hp outboard electric start motor that won't start anymore. I checked the voltage with a meter, and it seems that there is power everywhere up to the coils, but there is no power going from the coils to the plugs. I am not getting any spark. The funny thing is that since I first noticed the issue, it started a couple of times, and then wouldn't, then would, then wouldn't, and now it doesn't. I read some other posts, and checked the ground wire connections, and they seem clean. Could it be the switch box? I wanted to see if there was anything else to check before spending almost $300.00 for the switch box.
 

jjacobs007

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Mar 10, 2009
Messages
1,257
Re: '94 Mercury 90 HP outboard won't start

have a kill switch?check that maybe shorting out.Or neautral safety switch!
 

Kekoa

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May 28, 2009
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Re: '94 Mercury 90 HP outboard won't start

The kill switch seems to be okay. What should I check next?

Scott
 

airframer

Petty Officer 2nd Class
Joined
Nov 10, 2007
Messages
158
Re: '94 Mercury 90 HP outboard won't start

Check for corrosion at connections or loose wires
 

Kekoa

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May 28, 2009
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4
Re: '94 Mercury 90 HP outboard won't start

The connections are clean, no corrosion. They look pretty shiny under the black protectant stuff that they put on the connections. The big fuse is still good also. When I disconnect the fuse, nothing happens when I turn the key, then when I stick it back together, the motor cranks, but still no spark in any of the plugs. Is there anything else it could be besides the switch box?

By the way, thanks for your replies.
 

electricjohn

Petty Officer 1st Class
Joined
Dec 16, 2006
Messages
228
Re: '94 Mercury 90 HP outboard won't start

Someone recently posted a sequence of test to do on the ignition system for a 'no start' condition. Try a search.
 

jjacobs007

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Mar 10, 2009
Messages
1,257
Re: '94 Mercury 90 HP outboard won't start

check the no start in gear switch.
 

Kekoa

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May 28, 2009
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Re: '94 Mercury 90 HP outboard won't start

Where would the no start in gear switch be?
 

jjacobs007

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Mar 10, 2009
Messages
1,257
Re: '94 Mercury 90 HP outboard won't start

i believe in the throttle control box.
 
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