Wiring Harness (Open Circuit) - Test
Electrical problems are often caused by failed electrical wires that have either an open circuit or a short circuit.
If an electrical wire or a connection is broken, the flow of electrical current through the circuit is interrupted. This would be an open circuit. The following procedure explains the test for an open circuit.
Test for an open circuit.
- Turn the battery disconnect switch and the key start switch to the OFF position.
- Disconnect both ends of the wiring harness.
- Install a jumper (connecting wire) between two of the electrical wires at one end of the wiring harness.
- Use a multimeter in order to check for continuity across the same two electrical wires at the other end of the wiring harness.
- Turn the multimeter dial to the 200 ohm range and measure the electrical resistance.
- If there is continuity between the electrical wires, the multimeter will have a reading of less than 5 ohms. If there is no continuity, the electrical wire is faulty. The wiring harness must be repaired or replaced.
Caterpillar Information System:
GENSET, SR4, SR4 HV, SR4B and SR4B HV Electric Power Generation, 3126, 3176B, 3176C, 3196, 3408E, 3412C, 3412E, 3508, 3508B, 3512, 3512B, 3516, 3516B and G3616 Engines, 3406E GEN SET Generator Set, 3406E IND, 3408C IND and 3456 IND Industrial Engines Electrical Connector - Inspect
GENSET, SR4, SR4 HV, SR4B and SR4B HV Electric Power Generation, 3126, 3176B, 3176C, 3196, 3408E, 3412C, 3412E, 3508, 3508B, 3512, 3512B, 3516, 3516B and G3616 Engines, 3406E GEN SET Generator Set, 3406E IND, 3408C IND and 3456 IND Industrial Engines Wiring Harness
C32 Petroleum Generator Sets Air Shutoff - Test - Engines that are Equipped with Optional Air Shutoff Systems
C11, C13, and C15 On-highway Engines Emergency Stopping - Engines with Optional Air Shutoff Systems
Bench Test Procedure For A TH35-E81 Oil/Gas Transmission With A Drop Box {3030} Bench Test Procedure For A TH35-E81 Oil/Gas Transmission With A Drop Box {3030}
G3520B Industrial Engines Exhaust Bypass Valve - Adjust
Application, Installation, and Assembly Guide for On-Highway Cooling Systems for the CX28, CX31, CX31 HT, and the CX35 On-Highway Transmissions{1374, 1375, 1378, 1408, 3030, 7610} Application, Installation, and Assembly Guide for On-Highway Cooling Systems for the CX28, CX31, CX31 HT, and the CX35 On-Highway Transmissions{1374, 1375, 1378, 1408, 3030, 7610}
C13, C15, and C18 Tier 4 Final Engines Turbocharger
C11 and C13 Petroleum Engines Speed/Timing Sensor
C32 Marine Auxiliary Engine Plate Locations and Film Locations
2007/08/06 Improved Engine Software is Used {1901, 1902, 7620}
High Leak-off of the Electronic Unit Injector on C6.6 and C4.4 Engines {1251, 1290} High Leak-off of the Electronic Unit Injector on C6.6 and C4.4 Engines {1251, 1290}
GENSET, SR4, SR4 HV, SR4B and SR4B HV Electric Power Generation, 3126, 3176B, 3176C, 3196, 3408E, 3412C, 3412E, 3508, 3508B, 3512, 3512B, 3516, 3516B and G3616 Engines, 3406E GEN SET Generator Set, 3406E IND, 3408C IND and 3456 IND Industrial Engines Wiring Harness (Short Circuit) - Test
2007/10/01 Do Not Use the 261-3363 Wireless Communication Adapter with Model Year 2007 Cat Engines and Transmissions in On-Highway Trucks {0785, 1930, 7620}
14L Motor Grader Machine Systems Drawbar - Remove
2007/08/13 Improved Fasteners for the Rigid Harness and for the Electronic Control Module (ECM) {1408, 7553}
Oil Filler Tubes for the C7 and the C9 On-Highway Engine {1316} Oil Filler Tubes for the C7 and the C9 On-Highway Engine {1316}
C15 Petroleum Generator Set Engines Air Inlet and Exhaust System - Inspect
2007/08/20 New MS990 GNSS Receiver Firmware is Now Available {7010, 7620}
C32 Marine Auxiliary Engines Starting - Test
G3520B Industrial Engines Compressor Bypass
Incorrect Part Number{1361} Incorrect Part Number{1361}
C15 and C18 Engines Air Shutoff - Test - If Equipped
14L Motor Grader Machine Systems Drawbar - Install