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Tachometer is working, at least it’s reading and probably pretty close. It was the red +12V wire, that had no power. One by one it’s coming together.
That’s where I stand on it. Hopefully I can look into next weekend. I swapped out the switch, and I changed the wiring to add in a relay for the glow plugs and bypassed the faulty clutch switch, so I will have to trace wires again. I got my Chinese photo tach for a comparison when I get the tractor tach going.
Ok, I know that is not the best pic of the tach but it at least posted. Now I will try the schematic.
Both are good points and pretty much what I figured. I am not sure why some of my pics load and others don’t as they all come from my phone. The gauges are separate & not in a unit assembly. And they are all installed in the fiberglass body so they are not body grounded. There has to be a ground connection at some point. Also, the needle is not on zero and affordable said the tach needs power to reset it to zero but that does not tell me where the power comes from or goes to. Common sense would dictate the hour meter power source, but again you still need a ground for a complete circuit. The sensor is 2 wires which would give a voltage across the wires and the one side could be grounded.
It went. I figured the red wire, which comes from the fuse, is for the hour meter. And, the far right wire appears to come from the tail lamp, so I figured it was for the light. That leaves the sensor wires for the other two lugs, but there has to be a ground wire somewhere.
I am still struggling with the wiring. From the schematic, I have added some questions. If it will upload, that is.
That’s a good idea. I still would like to know that it’s wired properly and how the power flows through it. I bought the tractor well used and wonder if a previous owner tanked the tach somehow to keep the hours from adding up.
Thanks for the response. I wondered if that was the case because the temp meter does the same thing. I replaced one wire at a time so as not to cross any up. The old one would illuminate but the needle would not move. The rear of the housing was cracked and water actually poured from it the first time I looked at it. Can anyone help with troubleshooting this tach, i.e. proper wire placement, 12 volt source & ground, hour meter connection? It looks like the sensor is down by the oil sending unit and has 2 orange wires that go through a wire connector and then to the 2 right side lugs on the back. A white wire went to the lug left of them, and a red wire to the upper left lug. Now that I think about it, I believe one of the sensor lugs had another wire connected also.
Update: Disappointment with the new tach. Out of the package, the needle was showing over the redline. I hoped it would reset after hooking it up, but it never moved through any throttle position. I called Affordable, but it appears they were closed for the holidays. I sent an email to hopefully get this worked out. I did get the new boot on the gear shift and PB’d the glow plugs as a start for removal. Looks like I am also going to need to rebuild a tilt cylinder on the LZ-20 loader. I hope to get that done before snowfall.
