Hi All,
I have a 1993 Case 580SK 4X4 and none of the instrument panel gauges working correctly. I replaced the battery about 4 months ago and it starts like a champ even though it is sitting unused a lot. The gauges have not worked as long as I have owned it, and I'm finally summoning up the gumption to get into this. I've been reading other posts here on the issue and this has been extremely helpful. Following the advice here, I've performed the following -
Found and ensured that the instument panel breaker is fine.
Taken apart the panel and investigated the connections. So far this looks pretty good.
Found that the if I rev the engine to full, the Tach reads about 500rpm.
Based on seeing that the tach does work somewhat, my next suspicion is the alternator. As suggested, I checked the output from the W cable on the back of the alternator in AC mode. I am using a an autoranging digital multimeter, so I hope this does not affect how this unusual signal is read.
Pulling the yellow red wire and reading the output from W in AC mode, grounding to a bare point on chassis, I get 0.2 V. If I rev the engine, it gets up to almost 1V. Checking the wires coming into the back of the instument panel (yellow red to black orange), I get exactly the same reading as I did at the back of the alternator. Based on this, I'm assuming it is not a grounding issue.
My current conclusion is that I have a faulty alternator and should replace this before going any further. Does this seem correct? What else should I be checking? Am I possibly reading this incorrectly?
There is no alternator warning on the panel, but given nothing is working, I'm not assuming that means anything.
I'll deal with the other gauges later. I think this is going to be a long road.
Thanks in advance,
Julesy.
I have a 1993 Case 580SK 4X4 and none of the instrument panel gauges working correctly. I replaced the battery about 4 months ago and it starts like a champ even though it is sitting unused a lot. The gauges have not worked as long as I have owned it, and I'm finally summoning up the gumption to get into this. I've been reading other posts here on the issue and this has been extremely helpful. Following the advice here, I've performed the following -
Found and ensured that the instument panel breaker is fine.
Taken apart the panel and investigated the connections. So far this looks pretty good.
Found that the if I rev the engine to full, the Tach reads about 500rpm.
Based on seeing that the tach does work somewhat, my next suspicion is the alternator. As suggested, I checked the output from the W cable on the back of the alternator in AC mode. I am using a an autoranging digital multimeter, so I hope this does not affect how this unusual signal is read.
Pulling the yellow red wire and reading the output from W in AC mode, grounding to a bare point on chassis, I get 0.2 V. If I rev the engine, it gets up to almost 1V. Checking the wires coming into the back of the instument panel (yellow red to black orange), I get exactly the same reading as I did at the back of the alternator. Based on this, I'm assuming it is not a grounding issue.
My current conclusion is that I have a faulty alternator and should replace this before going any further. Does this seem correct? What else should I be checking? Am I possibly reading this incorrectly?
There is no alternator warning on the panel, but given nothing is working, I'm not assuming that means anything.
I'll deal with the other gauges later. I think this is going to be a long road.
Thanks in advance,
Julesy.