'79 115 blowing power packs

[mikesjohnson]

have a '79 115, have yet to make it run. the previous owner siad that it fryed a power pack, then promptly fried the other one before it ever hit the water. i havent et replace the power pack, or even run the engine. what would cause a power pack to go bad like this, and whar should i check for. all the wiring seems to be in good order.

 

[ezeke]

Re: '79 115 blowing power packs

Bad coils will continue to destroy the power packs. The coils need to be grounded carefully and the spark plug wires must not be automotive wires.

There are no shortcuts on the coils and coil wires. You need to take them loose, carefully clean them and the contact surface and reconnect. Pay particular attention to the ground wires.

Replacing parts without testing them is an expensive and usually unproductive process.

Here is a link to a troubleshooting guide that may help. Just hit the download button, but be patient, it is a large PDF file:

http://rapair.com/index.php?option=com_content&task=view&id=26&Itemid=34

 

[Joe Reeves]

Re: '79 115 blowing power packs

Find the black/yellow wire that leads to the powerpacks and disconnect them from the pack momentarily.

Connect a volt meter set to its lowest reading between those black/yellow wires and a powerhead ground. Turn the key to the ON position (engine not running).

If any voltage registers, even a microvolt, suspect a slight short in the ignition switch.

To check the switch, disconnect the black/yellow wire from the "M" terminal of the switch. If this causes the voltage reading to cease, replace the ignition switch.

Voltage being applied to that black/yellow wire, the slightest amount of voltage, will destroy the powerpack(s).