Help! No spark on 1974 45 hp

M

MontanaBob

Cadet
Joined
May 19, 2005
Messages
6
This motor will start 1 out of 10 times in a test tank. When it doesn't start, there is no spark but the starter cranks and cranks. I followed the manual and with a volt meter checked the batery:eek:k, checked the starter: ok, etc. got to the ignition switch and it didn't register 12 volts. Manual said to replace. I replaced it and $32 later it didn't change anything. Still no start, no spark. Points are next on the list in the manual.... Doesn't look like an easy job so I thought I would solicit opinions first. Could this be a grounding problem? Any help is very appreciated.
 
B

bnk999

Petty Officer 2nd Class
Joined
Mar 20, 2005
Messages
137
Re: Help! No spark on 1974 45 hp

When I first bought my boat it sat for 7 years '74-75hp chrysler- couldn't get spark -- turned out points were corroded- That's definitly next place to look
 
N

novicetech

Petty Officer 1st Class
Joined
Jan 19, 2004
Messages
267
Re: Help! No spark on 1974 45 hp

I agree, they are not that bad, the hardest part of the job is removing the flywheel.
 
S

scotiany

Senior Chief Petty Officer
Joined
Aug 3, 2002
Messages
749
Re: Help! No spark on 1974 45 hp

I took the flywheel off my '55 in 2003. One set of points were not opening. Sure ran better after I changed them and the condensers.
 
J

joe_morgan

Seaman
Joined
Mar 25, 2004
Messages
51
Re: Help! No spark on 1974 45 hp

I recently regapped my points and its running like a new engine. I spent the time and made sure the gap didn't close after I tightened the screw. Made a HUGE difference.
 
M

MontanaBob

Cadet
Joined
May 19, 2005
Messages
6
Re: Help! No spark on 1974 45 hp

Points were OK... Still no spark. I think the ignition is grounding out somewhere. I have run though the tests in the manual and probably am now out of my (mechanic ability)league so it's off to the boat mechanic.
 
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