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Discussion Starter · #1 ·
Ive recently swapped a 5.3 into my 03 Sierra base model single cab (was a factory 4.3) and I got a wiring harness out of a 02 suburban. My problem is that when I go to turn the key to accessory power it starts cranking the engine over, it does this in all key positions. Ive replaced the starter relay and that didn't help. Did I use the wrong harness?
 
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