Power Pack Testing?

bcamp2009

Cadet
Joined
Jul 25, 2009
Messages
12
I am looking for details on how to test a power pack for a 1971 / 125 hp Johnson. I have the Seloc manual and the trouble shooting section appears to have error's in it. Any suggestions would be greatly appreciated.
Thanks
 

bktheking

Vice Admiral
Joined
Jul 29, 2008
Messages
5,057
Re: Power Pack Testing?

This is from a 1970 60hp, it's known as a pulse pack assembly.


here's a test you can perform on the "Battery Capacitance Discharge System" which is a fancy OMC name for a battery powered pulse pack (powerpack). Using a 12v bulb, the type that looks like a flashlight bulb, solder a length of wire to the side of it.... the other end of which will go to a ground at some point on the powerhead. Solder another length of wire to the positive prong of the bulb.... the other end of which will be connected to the wire terminal that leads from the powerpack to the coil primary lead (usually a blue wire).

Make sure that you do have 12v applied to the p/pack when the key switch is in the on position.

With the s/plugs out and the key on, have someone crank the engine, or crank it via a jumper at the starter solenoid while you watch the bulb closely (CLOSELY). If the bulb glows even ever so slightly when cranking, the p/pack is good.

The post also said that the battery you are using has to be tip top or can burn out this pulse pack. They aren't cheap either, somewhere in the $400 range so you better be on the money for this part!
 
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