OMC Stringer Test of Switches and Electronic Shift Assist Operation
The electronic shift assist reduces shifting effort by limiting engine RPM. This also results in smoother shifting. When the vertical drive is all the way in forward or reverse gear the overstroke switch shuts off the electronic shift assist.
Start engine and run at fast idle (800 to 900 RPM) in neutral.
Hold shift arm at nominal neutral position. Move ignition interrupter switch cam in one direction then the opposite direction. See Figure 7-1-108. When switch plunger is depressed by cam the engine should "stumble" or misfire and slow down to 450-550 RPM.
3 If engine does not slow to 450-550 RPM, make sure electrical connections are clean and tight. If connections are clean and tight then disconnect Amphenol connector on switch leads.
With shift arm in neutral position, test ignition interrupter switch. Using adapter wires connect an ohmmeter or continuity test light to terminals C and 0 in connector. When ignition interrupter switch plunger is depressed, meter should show continuity. Meter should show infinity when plunger is not depressed.
If ignition interrupter switch tests correctly, then test overstroke switch. Connect ohmmeter or test light to terminals A and B in Amphenol connector. Meter should show infinity when switch plunger is depressed and continuity when plunger is not depressed.
Shift to full forward position. Move ignition interrupter switch cam toward forward position until cam depresses ignition interrupter switch plunger. Engine should not slow down from fast idle (800-900 RPM). See Figure 7-1-109.
- Shift to full reverse position. Move ignition interrupter switch cam toward reverse position until cam depresses switch plunger. Engine should not slow down from fast idle. See Figure 7-1-110.
If engine slows down when ignition interrupter switch plunger is depressed in either forward or reverse position, repeat Overstroke Switch Adjustment.
Next Step: OMC Stringer Installation of Shift Converter