Re: Black box for 55hp Evinrude
I had a similar problem 3 yrs ago.<br /> I have a 1978 55 Evinrude so electrical may be the same. The grounding wire that stops ignition is a Black/Yellow wire. This wire could have a high resistance short. Enough to weaken the spark maybe but when engine is running spark is stronger since magnet is passing stator much faster. Disconnect this wire and try to start.On the 78 this B/Y wire goes from the ignition switch to a small plug with 3 wires Orange, Orange and B/Y at the rear of engine near the Power Pack.<br />Heres some info from the internet, which is what I just said.
)<br />THE POWERPACK is the portion of the ignition system that stores electrical energy produced by the stator (or steps up battery voltage and stores it in older systems) and distributes this power to the ignition coils. The complexity of this circuitry causes numerous failure modes, generally the large storage capacitor shorts out.<br /><br />TROUBLESHOOTING TIP. All electric start motors have a "stop" or "kill" circuit that carries all the primary power thru the wiring harness and keyswitch as well as the emergency stop switch on newer models. Shorting of this high voltage circuit on magneto energized CD systems many times is the source of misses, intermittent spark, weak spark and NO spark. An easy test (and the FIRST test I run) is to disconnect the stop circuit at the powerpack plug-in or screw terminal. This wire will be black with a yellow stripe on all modern motors. This will isolate the harness, etc. and allow you to see if the motor's system is functional
