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Trailer connector problem
The above listed vehicle has a 4 wire trailer harness on it. The harness goes between the truck harness and the rear light harness. If the rear lights are not in the circuit, there is no voltage drop to the trailer harness. When the light are in circuit the tr... Login to read more. 
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| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1990 GMC C1500 Sierra SLE 5.7L
| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
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