'71 100hp no spark

K

kkinzie

Recruit
Joined
Jul 26, 2009
Messages
2
I have a 1971 100hp that stopped running. There is no spark when cranking except occassionally a single spark when turning the key off after cranking. Am I correct in thinking that would indicate the ignition coil is ok and by process of elimination the amplifier is at fault? Is anything else a likely cause? I will try the light bulb test for the amplifier when I have a chance. Points are set correctly.
Where is a good source for a replacement amp if required?
Thanks Ken
 
1

194269

Petty Officer 2nd Class
Joined
Jul 9, 2011
Messages
104
Re: '71 100hp no spark

The fact that it sparks after cranking makes me think the the amp is not getting 12 volts while cranking. I'd look at maybe a bad ing. switch.
 
B

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: '71 100hp no spark

Or low voltage when cranking. Bad battery, connections or cables??
 
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