How to bench test my electrical wiring - Request
A battery charger may or may not work as a power supply. Whether it works or not depends on if its rectifier is a half wave or full wave. Also battery chargers don't have voltage regulators or filter capacitors to remove the AC ripple voltage and they will have some AC voltage in their output. DC motors do not like any AC voltage. If you connect a charger to a battery and use it for a power supply, the battery will filter out the AC, but why not just use the battery by itself.
If you want to test the instruments, you will need a setup something like what I use. I have a 5 volt power supply and a precision potentiometer to simulate the resistance of the sending units. You can vary the resistance of the potentiometer and check the meter movement and make sure it reads correctly at the proper values.
A battery charger may or may not work as a power supply. Whether it works or not depends on if its rectifier is a half wave or full wave. Also battery chargers don't have voltage regulators or filter capacitors to remove the AC ripple voltage and they will have some AC voltage in their output. DC motors do not like any AC voltage. If you connect a charger to a battery and use it for a power supply, the battery will filter out the AC, but why not just use the battery by itself.
If you want to test the instruments, you will need a setup something like what I use. I have a 5 volt power supply and a precision potentiometer to simulate the resistance of the sending units. You can vary the resistance of the potentiometer and check the meter movement and make sure it reads correctly at the proper values.