With a DVOM
Remove the power feed (i.e. fuse, control module) from the suspect circuit.
Disconnect the load.
Set the rotary dial of the DVOM to the ohm position.
Connect one lead of the meter to one end of the circuit to be tested.
Connect the other lead of the meter to a good ground.
If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit.

With a Test Lamp
Remove the power feed (i.e. fuse, control module) from the suspect circuit.
Disconnect the load and connect one lead of the test lamp to battery positive voltage.
Connect the other lead of the test lamp to one end of the circuit to be tested.
If the test lamp illuminates, there is a short to ground in the circuit.

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Checking For A Short To Ground