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Hi all,
Would like to ask for assistance please. I'm experiencing an issues with the reading of my outboard info (rpms, fuel rate, etc) into my NMEA network (based on components from Lowrance). Basically, everything is working fine, until I throttle the motor up to higher rpms (above 5,000). As soon as I do that, the reading disappears (like if I'd turn the motor off). Once I back the throttle down (say below 5,000 rpms) the reading comes back. If I play with the throttle I can pick up rpms's where the reading 'flickers' e.g. constantly comes on and off. When it happens the NMEA itself is working fine, e.g. I have reading from other NMEA sensors with no interruptions.
My network has been double and triple checked and Lowrance-Suzuki interface has been replaced twice. Didn't help. I have also noticed that when this happens, the 'Alternator Voltage' parameter from the motor shows 15.1-15.2 Volts or maybe even more. And motor temperature was about 80 degrees Celsius. I have also been told (by Lowrance) that acceptable voltage level for NMEA (upper range) is around 14.2 volts.
I guess it narrows the issue down to 2 possible reasons. 1st - if there is something wrong with the motor itself so it does not always send the right data to the port. I suspect however (please let me know if I'm wrong) that I'd probably have more issues than just loosing the diagnostics if this is the case. 2nd - power problem, e.g. if the power the motor sends to NMEA is too high.
So may I please ask the experts:
1) Do my assumptions above sound right and high voltage can cause that sort of issues
2) Am I right in assuming that the Lowrance-Suzuki interface takes the power from the NMEA bus, not from the engine port itself
3) Are there known cases when the alternator voltage depends on rpm's (and maybe motor temperature) - e.g. higher rpms causing higher voltage
4) Is there a possible issue in the motor electric system and can it be rectified or adjusted?
Many thanks
Would like to ask for assistance please. I'm experiencing an issues with the reading of my outboard info (rpms, fuel rate, etc) into my NMEA network (based on components from Lowrance). Basically, everything is working fine, until I throttle the motor up to higher rpms (above 5,000). As soon as I do that, the reading disappears (like if I'd turn the motor off). Once I back the throttle down (say below 5,000 rpms) the reading comes back. If I play with the throttle I can pick up rpms's where the reading 'flickers' e.g. constantly comes on and off. When it happens the NMEA itself is working fine, e.g. I have reading from other NMEA sensors with no interruptions.
My network has been double and triple checked and Lowrance-Suzuki interface has been replaced twice. Didn't help. I have also noticed that when this happens, the 'Alternator Voltage' parameter from the motor shows 15.1-15.2 Volts or maybe even more. And motor temperature was about 80 degrees Celsius. I have also been told (by Lowrance) that acceptable voltage level for NMEA (upper range) is around 14.2 volts.
I guess it narrows the issue down to 2 possible reasons. 1st - if there is something wrong with the motor itself so it does not always send the right data to the port. I suspect however (please let me know if I'm wrong) that I'd probably have more issues than just loosing the diagnostics if this is the case. 2nd - power problem, e.g. if the power the motor sends to NMEA is too high.
So may I please ask the experts:
1) Do my assumptions above sound right and high voltage can cause that sort of issues
2) Am I right in assuming that the Lowrance-Suzuki interface takes the power from the NMEA bus, not from the engine port itself
3) Are there known cases when the alternator voltage depends on rpm's (and maybe motor temperature) - e.g. higher rpms causing higher voltage
4) Is there a possible issue in the motor electric system and can it be rectified or adjusted?
Many thanks
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