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New member here with a problem. Just got a boat with a df70 4 stroke on it and they gauges weren't working. Tested the sending unit ohms and it tested out ok. So I ran the grey wire from the control box to the ignition and light connections on the fuel and tach gauge. The tach worked but not the fuel. Last night I took the fuel gauge out and now I can't get either to come on. Checked the voltage of the grey wire and it's only 2 to 3 volts. It comes from the ignition and then splits, on to the main harness and the other to the gauges. Any ideas why it's dropping voltage? I checked all connections and they are good. Thanks for any info.
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Maybe the wiring is different but
The gray wire off the ignition is the main power to the ECM
It does have a split that goes through a 10a fuse, then a red/green wire to what the book refers to as the meter illumination switch ( Which I take as the NAV lights in my set up)
Off that red/green wire, there is a gray wire that feeds power to each gauge
I would not mess with the gray wire- the ECM is very voltage sensitive
I think the 2-3 volt reading is feedback
With the ignition key in the on position it should read 12V
If the gray wire is not reading -12 with the key in the on position
Then start back tracking the white wire back to the battery and btw the white
Wire also has a builtin 10 -
Thanks for the reply. I figured it out. The grey wire was putting out 12v. It was a bad ground. Got both gauges back in and they work. What a relief. Thanks againComment
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