yet another fuel gauge question.
This is why you need a test "standard" and that is why you need to emulate the factory guage tester. This was a swtichbox with three resistors, and we have discussed this on here:
Hey Del, Look what I found!!! An original Miller Gauge tester!!!
But you don't HAVE to use a test box or even three resistors. If you have a good ohmeter, and a fuel tank sender, or a good rheostat, you can just manually move the fuel sender TO the resistance specified for full, empty, or 1/2 and then hook that up........your gauge should emulate those readings.
How to eliminate sender: your "test" sender, whatever it is made of, should give you the same reading on both/ all three gauges. If they are all off.....
1....Your test resistance may be wrong, double check with a "known good" ohmeter
2.....Both / all three gauges could be bad. Might be unlkely. Do you suspect they are damaged? Do they all read the same? but just "all off"? Then the trouble is elsewhere
3....Voltage supply troubles. Make CERTAIN your sender and cluster are properly grounded to each other. On some models, the harness connector for the PC board can be broken. The stud nuts on the gauges can be loose / corroded. Make CERTAIN you have a min. of 12.6 supply volts. DO NOT USE a battery charger!!!
This is why you need a test "standard" and that is why you need to emulate the factory guage tester. This was a swtichbox with three resistors, and we have discussed this on here:
Hey Del, Look what I found!!! An original Miller Gauge tester!!!
But you don't HAVE to use a test box or even three resistors. If you have a good ohmeter, and a fuel tank sender, or a good rheostat, you can just manually move the fuel sender TO the resistance specified for full, empty, or 1/2 and then hook that up........your gauge should emulate those readings.
How to eliminate sender: your "test" sender, whatever it is made of, should give you the same reading on both/ all three gauges. If they are all off.....
1....Your test resistance may be wrong, double check with a "known good" ohmeter
2.....Both / all three gauges could be bad. Might be unlkely. Do you suspect they are damaged? Do they all read the same? but just "all off"? Then the trouble is elsewhere
3....Voltage supply troubles. Make CERTAIN your sender and cluster are properly grounded to each other. On some models, the harness connector for the PC board can be broken. The stud nuts on the gauges can be loose / corroded. Make CERTAIN you have a min. of 12.6 supply volts. DO NOT USE a battery charger!!!
