1970 Evinrude 85 hp ignition amplifier question

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enthuisiast

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Jul 22, 2004
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I purchased a Jolly Roger boat with the engine in question on it. <br /><br />The owner said the ign amplifier needs replaced. After extensive test I found this is so. So I replaced it and now the engine is running. <br /><br />The question I have is: I noticed the amplifier I replaced looks new, but was deffinatly bad. What causes ign amplifiers to go bad? There has got to be something else that is causing this problem. I dont want to ruin a $300 part. <br /><br />Thanks in advance for any comments you may have.
 
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ledgefinder

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May 2, 2002
Messages
916
Re: 1970 Evinrude 85 hp ignition amplifier question

1) "Dirty" voltage. You want to avoid spikes in the 12V electrical power to the amp. Use a big, well-charged batter. Make sure all the connections are clean an tight. If your battery uses wingnuts, tighten them with a wrench.<br /><br />2) Connecting the battery backwards (in polarity). This will also blow the fuse & rectifier.<br /><br />3) (Guessing here) An ignition coil that sporadically goes open circuit. The amp needs to dump it's voltage.
 
E

enthuisiast

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Jul 22, 2004
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Re: 1970 Evinrude 85 hp ignition amplifier question

Thank you for you information. I will look into that.
 
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ian c

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Aug 5, 2011
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Re: 1970 Evinrude 85 hp ignition amplifier question

I am in need of an ign amplifier for the same motor. Where did you buy that from. Thanks for your help.
 
T

tx1961whaler

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Joined
May 31, 2008
Messages
5,197
Re: 1970 Evinrude 85 hp ignition amplifier question

Welcome to iboats!
Please don't drag up 7 year old posts.
The amplifier is available here at iboats. CDI 113-7123
 
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