5.0 Mercruiser no spark

Racinmike77

Recruit
Joined
Jul 17, 2010
Messages
4
I just bought an 89 maxum and on the water it stalled out. I could not refire and found I have no spark coming from the coil. Replaced Coil and still have no spark. Is there possibly a bad module or a bad condensor? I am not very familiar with boats so where to find these parts and troubleshooot will help.
 

aktrucker

Seaman Apprentice
Joined
Aug 3, 2009
Messages
44
Re: 5.0 Mercruiser no spark

Check the voltage at the coil with the key on....
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,480
Re: 5.0 Mercruiser no spark

posting what type of engine and drive will help get a better answer
 

wnaplay

Petty Officer 3rd Class
Joined
Jul 6, 2010
Messages
95
Re: 5.0 Mercruiser no spark

Good luck. I have posted this same question on this exact same boat already.
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: 5.0 Mercruiser no spark

TB4troubleshooting.png
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: 5.0 Mercruiser no spark

So, have you tested the system and found that to be the problem? Or are you planning on throwing parts (aka $$$$$) at it till you finally replace the right part. Which could actually be a bad connection under the helm and not a bad part?
 

Racinmike77

Recruit
Joined
Jul 17, 2010
Messages
4
Re: 5.0 Mercruiser no spark

I have already tried a new coil, I do not see a bullett connector coming from the distributor. A quick walk through would be nice, I have a test light and a Noid light ready to rock.

EDIT: Phone numbers and email addresses not allowed on forums
 
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Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: 5.0 Mercruiser no spark

Noid light ???????

Got a Merc serial number of your engine handy? Is this EFI or carbed?
 

Racinmike77

Recruit
Joined
Jul 17, 2010
Messages
4
Re: 5.0 Mercruiser no spark

it is carbed, Where can i find the serial number? Have spark checker handy. No fire coming from the coil.
 
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