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WARNING: Do not allow flame or sparks near the battery. Gases are always present in and around the bat- WARNING: Always remove rings, watches, loose hanging jewelry and avoid loose clothing. DIAGNOSIS AND TESTING - WIRING HARNESS TROUBLESHOOTING TOOLS When diagnosing a problem in an electrical circuit there are several common tools necessary. These tools are listed • Jumper Wire - This is a test wire used to connect two points of a circuit. It can be used to bypass an open in WARNING: Never use a jumper wire across a load, such as a motor, connected between a battery feed and • Voltmeter - Used to check for voltage on a circuit. Always connect the black lead to a known good ground and CAUTION: Most of the electrical components used in today’s vehicles are Solid State. When checking volt- • Ohmmeter - Used to check the resistance between two points of a circuit. Low or no resistance in a circuit CAUTION: Most of the electrical components used in today’s vehicles are Solid State. When checking resis- • Probing Tools - These tools are used for probing INTERMITTENT AND POOR CONNECTIONS Most intermittent electrical problems are caused by faulty electrical connections or wiring. It is also possible for a • Connectors are fully seated • Spread terminals, or terminal push out • Terminals in the wiring assembly are fully seated into the connector/component and locked into position • Dirt or corrosion on the terminals. Any amount of corrosion or dirt could cause an intermittent problem • Damaged connector/component casing exposing the item to dirt or moisture • Wire insulation that has rubbed through causing a short to ground • Some or all of the wiring strands broken inside of the insulation • Wiring broken inside of the insulation 8W - 01 - 10 8W-01 WIRING DIAGRAM INFORMATION KJ |