You can check the GM/Mopar (Item 9220) or FORD (Item 9222) hall effect senders as follows:
*If you don't have a volt meter you can use a 12V bulb to indicate the 0V and 12V outputs. Make sure you hook the bulb up correctly before testing. The bulb will light up when the voltage output from the sender is 12V and will be off when the output from the sender is 0V.
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- hook up 12V power (red) and ground (black) to the sender
- connect a volt meter* + connector to the signal output wire from the sender (white). connect the volt meter - connector to the sender ground (black).
- turn the sender key (the square part that turns) slowly by hand. If the sender is good you will see the VOLTS go from 0V to 12V and back to 0V. The voltage value will cycle from 0V to 12V sixteen times for a full rotation of the sender key (16 pulses per revolution).
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