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I have twin 2005 F225s. I bought the boat a year ago and decided to do the mid section exhaust rebuild. The starboard motors power head was just rebuilt prior to purchase, supposedly ran aground and sucked sand in the motor. Both engines were scoped at that time and looked decent according to marina.
I got some time a couple weeks ago to rebuild the midsection on the port motor. This process went very smooth, however once the lower unit and power head were all remounted and buttoned up I found out I lost my key on beep for the port motor and had 0 RPMs. Initially I figured I missed a connection, but have looked it over several times and am certain I haven’t.
Steps taken so far.
1. confirmed continuity from green wire at ECM connector to the tachometer.
2. swapped the port and starboard tachometer to confirm gauge was working. The gauge was fine when connected to starboard motor.
3. Connected YDS to confirm it read the RPMs, it did. I assume the ECM is fine because of this? I did notice a code 28 (irregular shift position) in the YDS, which also made my alarm go off after about 5 minutes of running. All other signals were normal. When I cleared that alarm and moved throttle back and forth it didn’t immediately return and neither did the alarm.
4. Measured Hz on the green wire, it ranged from 100 to around 600 Hz.
5. measured Hz for comparison on my starboard motor it measured 70-300 Hz corresponding to 6-30 RPMs. Seems a multiple of 10. This didn’t match what I saw on my port engine.
6. Based on findings in YDS I also checked the neutral switch and the shift cut switch Both operated as expected.
I’m scratching my head as what to do next. It just seems odd this would happen when I removed the power head. Did I short something possibly? Any help or suggestions would be greatly appreciated. The good news is my exhaust that I replaced was in very good shape. Zero corrosion at the top of the exhaust, the gasket between mid and power head or the power head. I probably should have not changed it but I already had the components and it was worth the piece of mind.
I got some time a couple weeks ago to rebuild the midsection on the port motor. This process went very smooth, however once the lower unit and power head were all remounted and buttoned up I found out I lost my key on beep for the port motor and had 0 RPMs. Initially I figured I missed a connection, but have looked it over several times and am certain I haven’t.
Steps taken so far.
1. confirmed continuity from green wire at ECM connector to the tachometer.
2. swapped the port and starboard tachometer to confirm gauge was working. The gauge was fine when connected to starboard motor.
3. Connected YDS to confirm it read the RPMs, it did. I assume the ECM is fine because of this? I did notice a code 28 (irregular shift position) in the YDS, which also made my alarm go off after about 5 minutes of running. All other signals were normal. When I cleared that alarm and moved throttle back and forth it didn’t immediately return and neither did the alarm.
4. Measured Hz on the green wire, it ranged from 100 to around 600 Hz.
5. measured Hz for comparison on my starboard motor it measured 70-300 Hz corresponding to 6-30 RPMs. Seems a multiple of 10. This didn’t match what I saw on my port engine.
6. Based on findings in YDS I also checked the neutral switch and the shift cut switch Both operated as expected.
I’m scratching my head as what to do next. It just seems odd this would happen when I removed the power head. Did I short something possibly? Any help or suggestions would be greatly appreciated. The good news is my exhaust that I replaced was in very good shape. Zero corrosion at the top of the exhaust, the gasket between mid and power head or the power head. I probably should have not changed it but I already had the components and it was worth the piece of mind.
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