1990_OMC
Recruit
- Joined
- May 17, 2020
- Messages
- 3
1990 170Freedom Fourwinns 2.3L OMC stern drive
My boat has always been reliable. Its developed a new behavior coming out of storage. It cranks, but delivers no spark.
I’ve bypasses the safety switch on the dash
Replaced the coil - which tests within acceptable thresholds on the bench. New points (verified they open and close properly upon rotation), Cap, rotor button, condenser, wires and plugs - verification of no spark condition performed with a Lisle inline spark tester.
Testing completed; Meter hooked to + of coil and - of battery I get proper voltage in both run and start position. This should confirm that the purple/red are getting 12v in Run and the Purple/Black energizes in Start (these wires are bundled in one ring terminal connection - I cannot test them independently at the coil w/o cutting them). Ignition turned to the start pos. the motor cranks as it should bit produces no spark. The single grey wire from the coil to the distributor ohm tests fine. There are two other grey wires in a ring terminal - they do not ohm out at all - they appear to connect to something in the schematic (not identified, but look to have a purple from the alt hooked to the A side of the schematic / grey from the Coil to the B side) that then hooks in the E.S.A module (perhaps my problem is in this area)
When I pull the fuse on the dash, or have the transmission in gear, the engine will not engage the starter - this should confirm the neutral safety switch is operable and my fuses making proper contact.
Any additional thoughts on what I should test or bypass would be appreciated.
My boat has always been reliable. Its developed a new behavior coming out of storage. It cranks, but delivers no spark.
I’ve bypasses the safety switch on the dash
Replaced the coil - which tests within acceptable thresholds on the bench. New points (verified they open and close properly upon rotation), Cap, rotor button, condenser, wires and plugs - verification of no spark condition performed with a Lisle inline spark tester.
Testing completed; Meter hooked to + of coil and - of battery I get proper voltage in both run and start position. This should confirm that the purple/red are getting 12v in Run and the Purple/Black energizes in Start (these wires are bundled in one ring terminal connection - I cannot test them independently at the coil w/o cutting them). Ignition turned to the start pos. the motor cranks as it should bit produces no spark. The single grey wire from the coil to the distributor ohm tests fine. There are two other grey wires in a ring terminal - they do not ohm out at all - they appear to connect to something in the schematic (not identified, but look to have a purple from the alt hooked to the A side of the schematic / grey from the Coil to the B side) that then hooks in the E.S.A module (perhaps my problem is in this area)
When I pull the fuse on the dash, or have the transmission in gear, the engine will not engage the starter - this should confirm the neutral safety switch is operable and my fuses making proper contact.
Any additional thoughts on what I should test or bypass would be appreciated.