I have a '78 evinrude 70 that I brought back to life after sitting for over 15 years. When I put it in the water for a test run I determined I had no spark on the top cylinder. After testing all other components and playing the coil and trigge
r swap game I came to the conclusion the power pack is bad.
I have a '81 evinrude 70 that i picked up as a parts motor to use the foot on my '78. It was running when water got to the lower cylinder and wiped the lower main bearing. The '81 uses the new style potted power pack with quick disconnects instead of the screw terminals. I tested the triggers, coils, and timer base following the instructions in the factory manual and CDI electronics' website. So I swapped the motor wiring harness, coils, timer base, stator, rectifier, terminal strip and flywheel (basically all electrical from the big red plug back other than the choke, starter, and starter solenoid). I now do not get a spark on any coils. Everything tests fine as far as resistance values and output when cranking, so it appears this setup also has a bad power pack.
Either way I have to buy a power pack for either of the setups. I am wondering which of these two setups would be the one to go with. Is one more reliable than the other?
The prices seem to be about the same for replacement power packs. One thing I prefer on the newer setup is the timer base's coil seem to be encapsulated in plastic or resin versus the open style of the older setup. I would also think the QD plugs would be less prone to corrosion, though my old 78 pack still looked factory new under the cover. The screw terminals do make it nice for trouble shooting by being able to switch coil and trigger wires around without cutting anything.
Thanks for the input
r swap game I came to the conclusion the power pack is bad.
I have a '81 evinrude 70 that i picked up as a parts motor to use the foot on my '78. It was running when water got to the lower cylinder and wiped the lower main bearing. The '81 uses the new style potted power pack with quick disconnects instead of the screw terminals. I tested the triggers, coils, and timer base following the instructions in the factory manual and CDI electronics' website. So I swapped the motor wiring harness, coils, timer base, stator, rectifier, terminal strip and flywheel (basically all electrical from the big red plug back other than the choke, starter, and starter solenoid). I now do not get a spark on any coils. Everything tests fine as far as resistance values and output when cranking, so it appears this setup also has a bad power pack.
Either way I have to buy a power pack for either of the setups. I am wondering which of these two setups would be the one to go with. Is one more reliable than the other?
The prices seem to be about the same for replacement power packs. One thing I prefer on the newer setup is the timer base's coil seem to be encapsulated in plastic or resin versus the open style of the older setup. I would also think the QD plugs would be less prone to corrosion, though my old 78 pack still looked factory new under the cover. The screw terminals do make it nice for trouble shooting by being able to switch coil and trigger wires around without cutting anything.
Thanks for the input