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 MANUALSFORD1987THUNDERBIRD BASE, 3.8 3REPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCKPINPOINT TESTSTEST A (ABS WARNING LIGHT ON WITH BRAKE WARNING LIGHT OFF)TEST A3 (MAIN POWER RELAY SECONDARY CIRCUIT)

1987 Ford Thunderbird Base, 3.8 3

Test A3 (Main Power Relay Secondary Circuit)

1987 Ford Thunderbird Base, 3.8 3SECTION Test A3 (Main Power Relay Secondary Circuit)

Check continuity between breakout box pins No. 40 and No. 20 (Continental/Mark VII; Pins No. 40 and No. 15 on Thunderbird). If continuity present, go to TEST A4 . If no continuity present, go to TEST A3a .

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.