Lighting and Wiring Service Chapter 37 Page 477

Four Types of Electrical Problems Open Circuit- when a circuit has a break in continuity. Open Circuit- when a circuit has a break in continuity. Short Circuit- is a current path that is unwanted, causes burnt wires and parts. Short Circuit- is a current path that is unwanted, causes burnt wires and parts. Grounded Circuit- short that are directed to ground Grounded Circuit- short that are directed to ground Excessive resistance- corrosion causes less power to go through the conducted and it also picks up heat. Excessive resistance- corrosion causes less power to go through the conducted and it also picks up heat.

Circuit Defects Open Circuits

Circuit Defects Short Circuits

Circuit Defects Ground Circuits

Wiring Diagrams Newer Style Diagrams

Older Style Diagram

Electrical Symbols

Wiring Yellow and Red for positive voltage use and Black for ground use. Different types of wires

Solderless Connectors

Wire tools Auto strippers Crimping area Cutter section Stripper section Large terminal crimpers Small screw cutters

Repair Stripping Wire Crimp type repair Soldering Repair Crimping connector

Slicing a Wire

Soldering Use for wiring Use for copper, brass, and aluminum (radiator work) Acid Core Rosin Core

Tools Gun Iron Heat gun Multimeter

Fuses Don’t forget to check fuses and holders Don’t forget to check fuses and holders You can test for fuse problems with a test light or multimeter. You can test for fuse problems with a test light or multimeter.

Replacing Headlights

Light bulb Service Make sure the aligning notches engage Don’t handle glass with halogen bulbs *Wipe off fingerprints (alcohol)

Flashers If the flasher will work in one direction only, the flasher is the problem. If the flasher will work in one direction only, the flasher is the problem.

Wipers and Washers Check the fuse first Check the fuse first Check the washer for fluid Check the washer for fluid Check the lines and nozzles for blockage. Check the lines and nozzles for blockage.

Horns Always check the fuse first Always check the fuse first Check the relay Check the relay Check for voltage at horn and check for a good ground Check for voltage at horn and check for a good ground You an use a jumper wire to the battery to find out if a horn is good. You an use a jumper wire to the battery to find out if a horn is good.

Horns Check the fuse first Check the fuse first You can use a jumper wire to the battery to test the horn You can use a jumper wire to the battery to test the horn Check the horn’s ground Check the horn’s ground They are easier to diagnose if there are multiple horns They are easier to diagnose if there are multiple horns

Your Job. Complete chapter Questions 1-15 (review) and 1-10 (ASE-style). Page 492 Complete chapter Questions 1-15 (review) and 1-10 (ASE-style). Page 492 Write on a separate paper and write out the complete question and your answer. ( do not write the other answer options). Write on a separate paper and write out the complete question and your answer. ( do not write the other answer options). Complete the chapter worksheet (I will give it out). You may write on it. Complete the chapter worksheet (I will give it out). You may write on it. File all items in your note book. File all items in your note book. Notebooks will be graded in the future. Notebooks will be graded in the future.