Question about GMC Cars & Trucks
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Posted on Jan 02, 2017
SOURCE: spark plug wiring diagram
I dont understand why you would need that unless you took off all the wires and took out all the plugs and forgot how the wires were.I have the same truck and I always do the plugs and wires one at time to make sure I make a mistake.If this is your ploblem let me know because i might be able to walk you though it.
Posted on Jan 22, 2009
You can find free wiring diagrams at Autozone.com or if you want full access to wiring, mechanical and technical bulletins you can sign up at Alldata.com for a fee.
Posted on Jun 22, 2009
Yes u do....I have an 03 sierra and apparently they changed everything in 03.....the harness is over $100.....but u need it....and they dont sell a reg wiring kit from 03 and up....if it was an 02, then yes u could get away cheap......it has to do with the steering wheel switches
Posted on Jan 24, 2010
SOURCE: wiring diagram 2003 GmC Sierra
I need wiring digram for GMC 2003 SIERRA . I have the left head light working fine but the right I have no power to it. I have checked the fuses and relaysand so far have not found and broken or frayed wires.
Posted on Mar 06, 2010
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