Greetings, first post, and wanted to first say thanks for this message board as I have spent 2 days reading old posts and learning about my problem, which I believe I almost have figured out due to all the great info here...but still have a couple questions.
First, my boat is a 2007 Kayot Z201 with a Merc 5.0L MCM (serial 0W672003). I have 6 Faria gauges on my panel, speedo, tach, temp, oil, volt, trim. Other than the depth sounder beeping pretty much every time I put the boat in the water, and having to push the Mode button to turn it off, all the other gauges work fine, except the Temp gauge. It never moves and always stays at 0.
My first clue that the gauge was probably dead was than when I turned the ignition to ON (not crank), all the other gauges 'jump' a little (except speedo and tach because I believe those are mechanically controlled?), except the Temp, it never moves.
So i unhooked the sending unit tan wire, turned the ignition to ON (loud constant beep) and tried grounding the tan wire to some bare metal on the engine, gauge doesnt move.
I then checked the resistance from the side body of the sending unit to the engine, and its pretty much 0ohm...next I checked resistance from engine to tip of sending unit, and I get basically around 100ohms...I have a very cheap multimeter so when I touch the tip of the sending unit it shows me 100ohms for a couple seconds, then goes back to 0, then if I lift off and touch again, it shows 110ohms, or 115ohms, and back to 0 again, and I can do this over and over but it is usually around 100ohms.
Finally I checked to see if I was getting 12V to the gauge by checking voltage at the wire harness that plugs into the temp gauge, and I got 12.3V.
So I believe I can conclude the gauge is bad, but I have a couple questions...
Here is a pic of the harness that plugs into my temp gauge:
- As you can see, there is a black, blue, and purple wire. I'm guessing one is ground, one is 12V, and one is for teh sending unit signal?
But in this pic, the sending unit wire is clearly tan:
I can't follow the tan wire because it immediately goes into a black wire protective sleeve that contains a handfull of wires, and basically stays within this sleeve, which then joins into a larger sleeve, so there's no chance I could trace excetly where it goes unless I ripped everything apart, and that would take forever.
So my question is, is it common for this tan sending unit signal wire to splice up with either the blue or purple wire that is on my temp gauge wire harness? I figure it must, otherwise how else would the sending unit signal get to the gauge?
Also there are 4 pins on the gauge, but only 3 wires going into the harness. Maybe the sending unit wire got cut or pulled out of the harness? But I dont think so, because these gauges only need 3 inputs, right?
Here is a pic of the back of the non-working temp gauge:
The gauge is Faria part number GPC067A, which is located on the side of the gauge, on a sticker label.
One other problem is, Faira told me they no longer make this gauge, so I would have to find something compatible...but everything I have looked at does not have a pinout on the back that matches my harness...so I would have to cut the harness and manually wire it to the back of any new gauge I got...but I dont think that would be too difficult.
Any help or comments regarding my question about why there is no TAN wire going into the harness for the temp gauge (or any other comments) are greatly appreciated.
First, my boat is a 2007 Kayot Z201 with a Merc 5.0L MCM (serial 0W672003). I have 6 Faria gauges on my panel, speedo, tach, temp, oil, volt, trim. Other than the depth sounder beeping pretty much every time I put the boat in the water, and having to push the Mode button to turn it off, all the other gauges work fine, except the Temp gauge. It never moves and always stays at 0.
My first clue that the gauge was probably dead was than when I turned the ignition to ON (not crank), all the other gauges 'jump' a little (except speedo and tach because I believe those are mechanically controlled?), except the Temp, it never moves.
So i unhooked the sending unit tan wire, turned the ignition to ON (loud constant beep) and tried grounding the tan wire to some bare metal on the engine, gauge doesnt move.
I then checked the resistance from the side body of the sending unit to the engine, and its pretty much 0ohm...next I checked resistance from engine to tip of sending unit, and I get basically around 100ohms...I have a very cheap multimeter so when I touch the tip of the sending unit it shows me 100ohms for a couple seconds, then goes back to 0, then if I lift off and touch again, it shows 110ohms, or 115ohms, and back to 0 again, and I can do this over and over but it is usually around 100ohms.
Finally I checked to see if I was getting 12V to the gauge by checking voltage at the wire harness that plugs into the temp gauge, and I got 12.3V.
So I believe I can conclude the gauge is bad, but I have a couple questions...
Here is a pic of the harness that plugs into my temp gauge:
- As you can see, there is a black, blue, and purple wire. I'm guessing one is ground, one is 12V, and one is for teh sending unit signal?
But in this pic, the sending unit wire is clearly tan:
I can't follow the tan wire because it immediately goes into a black wire protective sleeve that contains a handfull of wires, and basically stays within this sleeve, which then joins into a larger sleeve, so there's no chance I could trace excetly where it goes unless I ripped everything apart, and that would take forever.
So my question is, is it common for this tan sending unit signal wire to splice up with either the blue or purple wire that is on my temp gauge wire harness? I figure it must, otherwise how else would the sending unit signal get to the gauge?
Also there are 4 pins on the gauge, but only 3 wires going into the harness. Maybe the sending unit wire got cut or pulled out of the harness? But I dont think so, because these gauges only need 3 inputs, right?
Here is a pic of the back of the non-working temp gauge:
The gauge is Faria part number GPC067A, which is located on the side of the gauge, on a sticker label.
One other problem is, Faira told me they no longer make this gauge, so I would have to find something compatible...but everything I have looked at does not have a pinout on the back that matches my harness...so I would have to cut the harness and manually wire it to the back of any new gauge I got...but I dont think that would be too difficult.
Any help or comments regarding my question about why there is no TAN wire going into the harness for the temp gauge (or any other comments) are greatly appreciated.