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.
Grounding "D" Wire At Transmission Using ALDL
Before performing this test, CHECKING VOLTAGE TO TERMINAL "A" AT TRANSMISSION USING ALDL test must pass. Connect one end of test light or jumper wire to terminal "A" at ALDL connector. See Figure. Road test vehicle. Vehicle can be tested on lift. At approximately 35 MPH, connect other end of test light or jumper wire to terminal "F" at ALDL connector. Torque converter should lock up. Proceed to COOLER LINE PRESSURE TEST .
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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.