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Blinkers not working - 1997 GMC Sonoma

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Have you noticed if the Bulbs on both Front and Rear are illuminated when the Signal Lever is indicating a Turn in either direction? If they are illuminating but not flashing there are two possibilities: 1). The Flasher is not the correct one for the number of bulbs per direction typically 2 or 3. 2): The Flasher is just plain defective. Other problems can be: Broken Wire(s), Corroded terminals in any connector between the Turn Signal Switch and the Lamp Sockets both Front and Rear, Burned out Bulb, lack of proper Ground connection to any Lamp Socket. Do the Tail Lights and Parking Lights illuminate normally? If they are somewhat DIM then I would suspect Poor Ground Connections, Try attaching a Temporary Ground to the Lamp Socket Housing(s) and see if it works, If they properly illuminate with Temporary Ground connections, then trace the Ground Wires for each Socket back to where they are attached to the Chassis or other Sheet Metal such as the Radiator Core Support in the Front and goodness only knows where in the Rear. Typically the Rears are Grounded directly to the Frame Rails somewhere along the Frame Rails along side the Wiring Harness. Another thing to check would be to make sure that there is a Ground Strap connecting the Engine and Chassis or Firewall. These are typically Braided Flat Copper cables that conduct the Ground circuit to the Chassis and/or Body. You will notice that these Ground Straps may have become detached and therefore you don't have a Good Ground Connection. In most cases, the Negative Battery Cable is attached to the Engine Block. If the Ground Straps are not in place then the Ground path is through the Transmission, Drive Shaft and Differential yielding a very poor Ground. Rubber Bushings in the Suspension do not conduct electricity. If none of this makes sense I strongly suggest that you take your vehicle to a reputable Auto Electric service shop.

Fastest Robe

Posted on Dec 07, 2009


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