Re: 1989 force 125 hp no spark
IF NO FIRE ON ANY CYLINDER:
Disconnect kill wire AT THE PACK.
Check for broken or bare wires on the unit, stator and trigger.
Measure DVA voltage of the stator between the output wire sets. With everything connected, readings should be approximately 180 volts or more. Resistance readings between the stator wire sets range from 680 - 800 ohms.
Disconnect the rectifier. If the engine fires, replace the rectifier.
I think I'm facing the same problem with my 1990 Force 120 - engine turns over but doesn't fire. Using a Check Spark, it's now reading a low voltage on each cylinder's spark plug wire.
The trouble started after starting the boat and idling to get it ready to pull out of the water for the season. I let the engine run/idle while I removed the cover from our lift. Once that was done, I turned the engine off, then went to start it again and there was no reaction. I came to find that the B (12V from the battery) contact on the ignition switch had cracked off. I replaced the ignition switch, but still struggled all day last Sunday with the engine not turning over. Once I verified all the wiring between the ignition and kill/safety switch to the motor, and installed a fully charged battery, then I could get the motor to turn over, but had poor/low spark readings.
After reviewing the forums here and the troubleshooting guide at outboardignition.com, I'm thinking that my rectifier is fried. I'll try disconnecting that and see if the engine will start (and if it does, then I'll be replacing the rectifier). The stator and trigger contacts Ohm'd out correctly, btw. There's a slight sign of overheat/melt on the rectifier body near one of the mounting screws for the rectifier, which also makes me think something is up with it.
