1979 25 HP Evinrude

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skip44820

Petty Officer 2nd Class
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Dec 13, 2020
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Guy brought me a motor with no wiring on the motor. Got my repair Manuel out and got most wires in place, having trouble placing black wire with yellow stripe, I know it the kill wire but when it comes out of rubber plug that had the coil wires in it my book shows the black with yellow running over to power pack. Need help here. Also hooked battery up to check spark and only had spark on top cylinder, bottom nothing. Help is appreciated as always
 
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skip44820

Petty Officer 2nd Class
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Dec 13, 2020
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I have same wiring diagram Thanks for info. I have 125 psi each cylinder. I am not using harness here. I am using start button directly to solenoid. I changed location of coils, no difference. Last night neighbor came over. We decided to cut coil wire and wire in the dead coil to the wire that is getting good spark., nothing blew up here. Let me say here before we did this we did get a small spark, not good like we are getting on the other but a little spark. I don't know what that means???? weak coil??? The trigger and the staTor check out. I ordered new power pack and 2 coils. Any thoughts????
 
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Crosbyman

Vice Admiral
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Nov 5, 2006
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no expert on CDI stuff but new coils and power pack should solve the problem. just make certain all connections are clean.

you could try and compare things like ohms from the secondary HV plug boot to engine frame and coil primaries to see if they spec out ok and identical . is they are the powerpack may be the next suspect .
 
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skip44820

Petty Officer 2nd Class
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Dec 13, 2020
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174
I put new wiring harness on and having no luck. Can someone please tell this old man what wires go where . I have yel red to bottom small bolt on solenoid, yel red from other small bolt on solenoid to safety switch,Red to big post on solenoid, also from that big post red to other side motor to front of bar above choke. black and yel to black and yellow. Now ground does it matter where ground wire goes??? Purple with white to choke. I am only getting spark on 1 cylinder
 
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Crosbyman

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yellow-red on selenoid small post is the wire that activates the solenoid...when the neutral switch is closed ..when throttle is in NEUTRAL.

when that condition is met and the key is put on START the solenoid will get the starter motor to run. Seems to work ok since you have generated sparks on one cyl. !

Solenoid big post RED comes from the battery and will be transferred to the solonoid when the above start process functions properly. Seems to work ok since you have generated sparks on one cyl. !

Being the main B+ post from the battery, smaller RED wires are frequently bridged on to distribute B+ via a fuse . Another wire comes from the rectifier and/or rectifier -regulator to backfeed B+ engine generated DC back to the battery to charge it.

yellow black wires are ignition kill wires when yellow-black is xconnected to black ground in the ignition switch in the OFF position

Choke is just a magnet under control of the ignition switch when pushed in to assist starting...nothing to do with ignition sparks.

since you are having sparks on one cyl. you are likely having a problem specific to that faulty cyl. It is unlikely the rest of the wiring is at fault.

if not a power pack fault not much left...

-you did try new spark plug ? or swapped them
-powerpack to coil wire open or chaffed. ckeck accessible connections
-coil defective (measure primary winding to ground) try swapping coils
-suspect coil ouput HV secondary winding to plug boot open
-diagram if aplicable to your mdl. shows a connect between pack wires and coils ... if you do have one... open it check contacts . apply contact cleaner ..check for oxydation

best I can suggest... I don't have the wire diag. for the 79
 
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saltchuckmatt

Commander
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Jul 19, 2019
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2,794
skip44820 said:
Guy brought me a motor with no wiring on the motor. Got my repair Manuel out and got most wires in place, having trouble placing black wire with yellow stripe, I know it the kill wire but when it comes out of rubber plug that had the coil wires in it my book shows the black with yellow running over to power pack. Need help here. Also hooked battery up to check spark and only had spark on top cylinder, bottom nothing. Help is appreciated as always
Click to expand...
Pictures?

Solenoid.... Neutral switch located starboard side.

Test that switch.
 
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skip44820

Petty Officer 2nd Class
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Dec 13, 2020
Messages
174
Put new power pack on, now have spark on both cylinders. Put new coils on as well. Good spark now. Not or will not fire. Going to replace neutral safety switch tomorrow evening, ill keep you posted. Thanks to all
 
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saltchuckmatt

Commander
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Jul 19, 2019
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2,794
No need to replace safety switch if you have good spark. Look elsewhere or retest for GOOD spark.
 
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skip44820

Petty Officer 2nd Class
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Dec 13, 2020
Messages
174
I have a 35 HP 1980 2 stroke on hand. It fires right up. I took wiring harness, coils, power pack everything right down to the starter solenoid and still no fire. I'm taking it to another fellow that works on outboards before I go crazy
 
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skip44820

Petty Officer 2nd Class
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Dec 13, 2020
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174
he only works on mercs.
I ordered a new stator. crossed plug wires still nothing
 
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racerone

Supreme Mariner
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Dec 28, 2013
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38,089
I would say if spark can jump a gap of 3/8" or more then stator is good.---If you lay a sparkplug on the block and see spark , that does not mean stator is good.
 
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