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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 229 (CRUISE CONTROL SYSTEM)TROUBLE SHOOTINGTESTING FOR PROPER TERMINAL CONTACTROUND WIRE CONNECTORS
1999 GMC Forward Control 5.7 R, Automatic
Round Wire Connectors
1999 GMC Forward Control 5.7 R, AutomaticSECTION Round Wire Connectors
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Follow the procedure below to test terminal contact of Metri-Pack or 56 series terminals. Refer to the Terminal Repair Kit (J 38125-B or J 38125-4) instruction manual for terminal identification.
- Separate the connector halves.
- Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body.
- Using an equivalent male terminal from the J 38125-8, test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question.
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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.