Mercruiser 3.7....no fire

Wayne in MO

Cadet
Joined
Aug 1, 2010
Messages
9
Started up all day long on Thursday, now won't fire. Electronic ignition, put on new coil, checked plug wires, plugs, distributor cap and rotor.....still no fire. Any suggestions?
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Mercruiser 3.7....no fire

Kill switch have the lanyard installed? Do you have power to the + terminal of the coil with the key in the run position? Could be a coil, have you checked the coil with an ohm meter? It may also be the electronic conversion. No way of testing those things.
 

Wayne in MO

Cadet
Joined
Aug 1, 2010
Messages
9
Re: Mercruiser 3.7....no fire

Installed two different coils, still no fire. Will not fire with points either.
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Mercruiser 3.7....no fire

did you check the voltage too the coil while cranking?
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Mercruiser 3.7....no fire

No, haven't done that.

Well, you better go do it. You won't know what to fix until you do.

Meter on VDC, black lead on good clean unpainted ground, red lead on the + terminal of the coil. Crank the engine over and see what the voltage is while cranking.
 
Top