I've read through several threads on getting Fuel and Temp gauges working. Both of mine are bottomed out, stuck on E and C respectively. With the ignition switch on I have 12V at the red wire on the fuel gauge and the pulsing up to 8V on both other studs of the fuel gauge. When the temp gauge is connected the pulsing is present on both studs there as well. I ran a ground wire from the battery to one ear of the gauge cluster so I'm assuming the gauges are grounded but I've got to be missing something. If the sending unit sides should be grounds why would I be getting the pulsing voltage there?
This is a '63 Crew Cab.
Fuel and Temp gauges, read other threads and seeing a different problem
Re: Fuel and Temp gauges, read other threads and seeing a different problem
Sounds like a possible issue with the voltage limiter, What year is your truck?TWC wrote: ↑Sat Aug 11, 2018 7:13 pmI've read through several threads on getting Fuel and Temp gauges working. Both of mine are bottomed out, stuck on E and C respectively. With the ignition switch on I have 12V at the red wire on the fuel gauge and the pulsing up to 8V on both other studs of the fuel gauge. When the temp gauge is connected the pulsing is present on both studs there as well. I ran a ground wire from the battery to one ear of the gauge cluster so I'm assuming the gauges are grounded but I've got to be missing something. If the sending unit sides should be grounds why would I be getting the pulsing voltage there?
This is a '63 Crew Cab.
You should have 5V on the gauges, if memory serves.
John
Re: Fuel and Temp gauges, read other threads and seeing a different problem
The truck is a '63. What I read is that the voltage pulses to mimic a 5V power supply. Maybe I'm misunderstanding that but should the sending unit side of either gauge have any voltage at all on them?
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Re: Fuel and Temp gauges, read other threads and seeing a different problem
The sending unit side of the gauge will read the same voltage as the other side IF there is no sending unit connected.
Re: Fuel and Temp gauges, read other threads and seeing a different problem
That's good to know. I grounded the sender side and got it to peg Full and there is still voltage on the pin. I'm seeing the fuel needle move now and it's probably close to accurate so I think everything is right there as long as having voltage on the sender side is normal. I'll have to bring the truck up to operating temperature to see if the temp gauge is working though. The difference was running a new ground wire through the bulkhead connector to the battery and ripping the existing ground out.
Re: Fuel and Temp gauges, read other threads and seeing a different problem
One last note on getting the gauges to work properly and I'm not sure why it had to be done but it worked. With the housing grounded and the sending unit sides attached I grounded the nut at the bottom of each sending unit side until the gauges pegged. After that they both work normally.