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power pack

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unc

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i have a 1977 evinrude 4 that i am not getting any fire i replaced a coil is their any way to check the power pack
 
It's a good idea to have one of those packs in your onboard tool kit along with the proper tools to change it so as not to ruin a days outing. With this in mind, the best way to check that pack is simply to install another one that you know is good.

Should you or anyone have this type ignition (Magneto Capacitance Discharge) powerpack fail more than once and often, see the following cause and what to do about it.

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Voltage To Powerpack Failures
(Magneto Capacitance Discharge Systems)
(J. Reeves)

The usual cause of having those type powerpacks fail repeatedly is having a very small of voltage applied to the Black/Yellow wire (Kill Circuit) at the pack. Test as follows.
Disconnect the Black/Yellow wire at the powerpack.

Insert either a ampere meter or a volt meter set to its lowest DC voltage reading between that Black Yellow wire and ground.

With the ignition key in the OFF position, observe the meter reading. Now turn the ignition key to the ON position and again observe the meter reading.

Any reading, movement of the meter needle, even a microvolt, would indicate that battery voltage is being applied to that Black/Yellow wire. If a reading is present, remove the other end of that Black/Yellow from the raised terminal of the ignition switch.

If the reading ceases to exist when the Black/Yellow wire is removed from the ignition switch, replace the switch. If the reading continues to exist, there would be a short of some kind in either the engine or instrument wiring harness.... to determine which, simply unplug the large RED electrical plug at the engine which would eliminate the instrument cable.

Note that the black/yellow wire must not have any other wire attached to it for the following reason!

Keep in mind that any accessory that has 12 volts running to it, especially when turned on, will have voltage flowing thru it and trailering out thru its black ground wire to complete the circuit. If that accessory has it's black ground wire attached to the "M" terminal that the black/yellow wire is attached to.... you will have voltage flowing directly to the powerpack.

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racerone said:
I do not believe there is 12 volts any where on a 4 hp motor.-----------Nor an ignition switch.
Click to expand...

I'm, aware of that fact racerone and you are quite correct. However he doesn't say 4hp... he just states "4" and I took that to possibly mean "4 cylinder" as many boaters have a habit of leaving out vital information and I didn't feel like going back and forth dragging out this and that over a period of days. Anyhow, regardless of what engine it might be, the info is still useful.

And no, I've never heard of anyone applying 12v to a 4hp engine either... BUT... I did hear of a fellow who put a 110v electric drill with a socket on the flywheel nut of one while it was in a barrel of water.

Wonder what ever happened to that fellow? :rolleyes:
 
joereeves said:
I'm, aware of that fact racerone and you are quite correct. However he doesn't say 4hp... he just states "4" and I took that to possibly mean "4 cylinder" as many boaters have a habit of leaving out vital information and I didn't feel like going back and forth dragging out this and that over a period of days. Anyhow, regardless of what engine it might be, the info is still useful.

And no, I've never heard of anyone applying 12v to a 4hp engine either... BUT... I did hear of a fellow who put a 110v electric drill with a socket on the flywheel nut of one while it was in a barrel of water.

Wonder what ever happened to that fellow? :rolleyes:
Click to expand...

it is a 4 horse with a fly wheel that will not budge trying to pull it i have a harmonic ballancer puller on it yes the nut is off
 
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