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rotorwrench · 05-13-2021, 08:27 AM

Most of the old meters have a little spring to return the needle to center unless it is counter weighted or magnetically centered. The needle may also have slipped on the armature. Many of these types of meters can be repaired but it would be advisable to send it out to an experienced instrument restoration service. Amp meter just take a sample of the electrical energy that flows through them. I suppose that one could be fried to the point that the shunt is burned out but a quick check with a Volt/Ohm meter or 6-volt test light would rectify that possibility.

If your commercial vehicle has a V8, there may be a problem with the ballast resistor. I'm not sure if the model B 4-cylinder had this or what coil it used but if it was like the model A then it may not have a ballast resistor. In that case the switch & the wire would be the only things to check.

05-13-2021, 08:27 AM	#5
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 18,007	Re: 32 amp gauge Most of the old meters have a little spring to return the needle to center unless it is counter weighted or magnetically centered. The needle may also have slipped on the armature. Many of these types of meters can be repaired but it would be advisable to send it out to an experienced instrument restoration service. Amp meter just take a sample of the electrical energy that flows through them. I suppose that one could be fried to the point that the shunt is burned out but a quick check with a Volt/Ohm meter or 6-volt test light would rectify that possibility. If your commercial vehicle has a V8, there may be a problem with the ballast resistor. I'm not sure if the model B 4-cylinder had this or what coil it used but if it was like the model A then it may not have a ballast resistor. In that case the switch & the wire would be the only things to check. Last edited by rotorwrench; 05-13-2021 at 08:35 AM.