Mechanics

LEFT SIDE HEADLIGHT , SIGNALS, TAILLIGHT

2003 GMC Sonoma

Electrical problem
2003 GMC Sonoma 6 cyl Four Wheel Drive Automatic

Well to begin with about a year ago I put a plug n play wire harness for a trailer on my truck.(No cutting or splicing). Just a short time ago when I turn my left signal on, my dash and stereo lights blink along with it. This also is happening when I tap the brake pedal. My left tail light does not work unless I turn the switch" on" , on the dash. But when I do this my left signl does not work and the arrow indicator stays on with out blinking.
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Bryanboutilier
February 20, 2010.



Check and clean your grounds, it seems to be overloadig the system causing it to do what you are experiencing. Check the body ground at abttery and engine to battery as well.

Hmac300
Apr 3, 2010.