Load Testing A Circuit For An Open Or High Resistance

DIAGNOSTIC LOAD TEST (OPEN/HIGH RESISTANCE CIRCUIT) 

Fig 1: Performing Diagnostic Load Test (Open/High Resistance Circuit)

Courtesy of CHRYSLER GROUP, LLC

1. Disconnect all components from the circuit being tested.
2. Connect the positive lead of the load test tool to the positive side of the battery (A).
3. Using an approved connector back probe tool, connect the negative lead of the load test tool to the circuit being tested at point (B).
4. Using an approved connector back probe tool, connect a jumper wire to the circuit being tested at point (C).
5. Then connect the other end of the jumper wire to the negative side of the battery or ground (D).
   CAUTION:

   Use only approved connector back probe tools when back probing a connector so as not to cause damage to the terminals or insulation of the connector. Damage to the terminals can cause poor terminal contact or retention. Damage to the insulation can introduce corrosion due to water infiltration.

   Does the bulb light bright, when compared to a direct battery connection?

   Yes 

   • The circuit being tested can carry a load, check other circuits, connectors and terminals for concerns.

   No 

   • Repair the circuit, connector or terminal that has an open or excessive resistance.
   • Perform any related Recalls or Technical Service Bulletins (TSBs) that may apply.