Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC1993FLEETWOOD BROUGHAM V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTOOLS AND EQUIPMENTTEST-LIGHTS
1993 Cadillac Fleetwood Brougham V8-350 5.7L
Test-Lights
1993 Cadillac Fleetwood Brougham V8-350 5.7LSECTION Test-Lights
Non-Powered Test Light:
TEST LIGHTS
Two types of test lights, the circuit powered test light and the self-powered test light, are commonly used to test automotive electrical circuits. Both test lights are usually referred to as 12-volt test lights.
CIRCUIT POWERED TEST LIGHT
Uses vehicle battery or circuit voltage, to light the test lamp.
Use to check for power or ground.
Verify lamp operation, before using, by connecting the clip to one battery terminal and touching the probe to the other battery terminal. The test lamp should light.
SELF-POWERED TEST LIGHT
Uses an internal battery to light the test lamp when continuity exists between the test probe and the clip.
Use to check circuit opens or shorts.
Before using, verify operation by connecting the clip to the test probe: the test lamp should light.
CAUTION: DO NOT connect a self powered test light across a 12 volt circuit. This will burn out the bulb.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.