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Technically yes, almost everything metal attached to your chassis is the "ground cluster". Each system will have it's own ground, and even several components within each system can have dedicated grounds, especially with a system like the lights where they're literally at the furthest corners from each other. You didn't give a whole lot if useful information, but I'd be looking at SDK the grounds, and possibly the turn signal switch, or the relay.is there a common ground cluster un my truck? 1996 gmc k 3500. some times my turn signals work, sometimes not.
That was a SDK was a typo.What other useful info is needed? What is sdk?