No spark please help

[littletex]

I have a 1988 mercury 100hp motor with no spark . I've changed plugs , wires & coils , still no spark . There is no kill switch on my boat either . 1988 sea ray Seville . Getting fuel as well . Any ideas ?? Thank you so much for your time ..

 

[Mortamie]

Re: No spark please help

Does it have points? If it does you need to check your points and switch box... It might be one of those.. I am having same problem with my 1966 merc 950 .. My father in law who is a mechanic says that it is usually one of those.... Worth checking anyway

 

[TD_Maker]

Re: No spark please help

No spark at all? I would seriously look at your key switch circuit. If the key switch is shorting out to ground, you have found the problem.

 

[1nebel0]

Re: No spark please help

Mercury's love to eat switch boxes........There are no points in this motor.........real simple....go to the switch box and take off the yellow with blk stripe wire...if it starts, it is the kill circuit...

 

[TD_Maker]

Re: No spark please help

Good job 1nebe10 I no longer have my shop manual to find the wiring diagrams. I am still leaning towards key switch .