Re: 1989 Force 50hp motor electrical schematic
Preliminary Check.<br />remove the spark plugs, using a spark tester crank, the engine and observe a good crisp spark. I dont have a spark tester myself, but holding a spark plug tight against the chassis with an insulated tool you should be able to observe the quality of the spark. This does risk getting a shock if one isnt careful.<br /> a spark tester is easier. ( this is a spark plug wire with a small air gap, then a crocodile clip to the chassis)<br />If no spark the fault is one of the following four things, probably.<br /><br />Stator test.<br />Disconect the yellow and blue stator wires from terminal block, should be numbered 1 to 4. A special meter is needed, one that reads peak voltage.(DVA)such as mercury marine multimeter No 91-99750.Well I dont have one of these <br />either, so we are looking for a Peak voltage of 210 volts while cranking the motor, a normal meter wont show 210 volts but may give a kick in the needle each rev of the motor.Test wires 1 and 2 then 3 and 4, same voltage.<br /><br />Trigger test.<br />Disconect green and orange trigger wires from terminal block.Test these wires with the same peak voltage meter, Looking for a peak voltage of 0.3volts.<br />reconnect orange and green wires. disconect white and red wires, Looking for a peak voltage of 0.3volts once again.<br /><br />CD module test.<br />test the output from the CD module with the same peak voltage meter.make sure white stop wire circuit is disconected.<br />disconnect the orange and red output wires that connect CD module to the High voltage coil. while cranking the engine, looking for 210 volts between orange or red output wire and chassis.<br /><br />Ignition coil test.<br />If all the above checks out and there is still no spark, the problem is the ignition coils, But as there is two of them, it should be obvious with a spark test if only one is dead.<br /><br />A bit difficult to test these components without peak voltage meter but might be able to determine if stator or trigger is totally dead or not.<br />An oscilloscope would show this pulse of voltage, should you have one of those tucked away. Hire companies may have a peak voltage tester.<br />Hope it helps.
