will not start

[jwood99]

1998 90 hp evenrude

It ran last week but not this week.
The starter turns over but will not start.
I replaced the fuel pump and the starter primer solenoid still no start.
NONE of the four spark plugs fire (i tested against the engine bolts-no spark on any)

It seems unlikely that all four coils went out at once.

The only other thing i can think of is this box (see photos) I do not know the name. The last pic shows the brown wires going to the starter, orange to the spark plugs and the purple/blue back to the boat.

What should I check/replace next?

[Joe Reeves]

If there is a black/yellow wire at the ignition switch, disconnect it from the switch. Then, with all the spark plugs removed, test for spark again. If you have spark with that wire disconnected and no spark with it connected, replace the ignition switch.

[jwood99]

Last night i disconnected the black/yellow wire going into the power pack and i now have 3 of 4 of the spark plugs firing.

If i re-connect the black/yellow wire, the spark plugs no longer fire.

As for the one coil not firing, I ran it's spark plug and power wires to the lower coil and it did fire so i thin k i need to replace the one coil.

I will try the ignition switch. What do you think about the coil i described?



http://www.cdielectronics.com/wp-con...1/113-4767.pdf

NO SPARK ON ANY CYLINDER:
1. Disconnect the black yellow stop wire from the power pack and retest. If the engine's ignition has spark, the stop circuit has a fault-check the key switch, harness and shift switch.

Thank you for your time!

[Joe Reeves]

Yes.... sounds like a shorted ignition switch and one bad coil.