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So the check gauge is LED's, not lights so cannot check for continuity. However, I can and did check them using the diode function of the multi-meter. As expected, three work fine (conduct forward polarity-nothing reverse polarity), however the Rev Limit does not test as expected. I too worried I might have damaged the Rev Limit gauge by grounding the pink wire instead of applying +12v. I hope not, but if I did, not a huge deal as I have three other warning lights, including the two I need Over Temp and Oil Press. I also have a useful indicator that I can use for other purposes with the generic Check Engine legend. As pointed out, that is all I need.
Fairdeal you make a good point. In addition to the ECM not providing the functionality, the Yamaha wiring harness also doesn't carry a signal for anything else. The reason that I am pursuing this is I always try to completely understand anything I am building and it drives me nuts when I must just accept something without understanding why. A bit of OCD perhaps? I would really like to know what the Rev Limit light is expecting, and I think from the schematic above, it is pretty clear that it wants a +12v to light. Unfortunately, I cannot open it up without doing significant damage to the instrument body. I am not prepared to do so at this time as I want to use the instrument. Maybe later I will cut the back off and take a look at the circuit board.
On a side note, I also have a blank gauge that I hoped I could use to make my own warning light panel, but it has the same problem. I cannot access the inside of the gauge, at least easily, to add circuitry. I have a simple circuit that I designed to monitor the fuses on my bilge pumps that I thought about including inside the blank gauge. The circuit uses a bicolor LED that glows green if the pump supply circuit is hot and will glow red if the pump fuse is blown or missing. A quick check for a bit of peace of mind. I will probably add these to my bilge switch panel instead.
Fairdeal you make a good point. In addition to the ECM not providing the functionality, the Yamaha wiring harness also doesn't carry a signal for anything else. The reason that I am pursuing this is I always try to completely understand anything I am building and it drives me nuts when I must just accept something without understanding why. A bit of OCD perhaps? I would really like to know what the Rev Limit light is expecting, and I think from the schematic above, it is pretty clear that it wants a +12v to light. Unfortunately, I cannot open it up without doing significant damage to the instrument body. I am not prepared to do so at this time as I want to use the instrument. Maybe later I will cut the back off and take a look at the circuit board.
On a side note, I also have a blank gauge that I hoped I could use to make my own warning light panel, but it has the same problem. I cannot access the inside of the gauge, at least easily, to add circuitry. I have a simple circuit that I designed to monitor the fuses on my bilge pumps that I thought about including inside the blank gauge. The circuit uses a bicolor LED that glows green if the pump supply circuit is hot and will glow red if the pump fuse is blown or missing. A quick check for a bit of peace of mind. I will probably add these to my bilge switch panel instead.
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