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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2009 Posts: 2 New Guy | | New Guy Joined: Jan 2009 Posts: 2 | I am taking out all of the old wiring and installing a new wire harness. Anybody have any advise on what to expect or avoid? | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | expect to get a kink in yer neck working under the dash, as well as some junk in yer eyes avoid frying anything .... don't re-install the battery unil you've inspected everything and are sure you got it right and welcome to the shop, we'll help ya thru it  Bill | | | | | Joined: May 2004 Posts: 1,312 'Bolter | | 'Bolter Joined: May 2004 Posts: 1,312 | Take your time. Ensure that all crimped connections are solid - ie. yank on them !. Use grommets where you pass thru metal. Spliced wires should be soldered. I used heat shrink tubing on the splices as well for extra protection. Make sure your ground connections are good & solid. Run ground cables from motor to frame and body points. | | | | | Joined: Mar 2008 Posts: 3,750 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 3,750 | Hi Loomup,welcome.
Another tip, if you have the room that is....
Lay the loom out on the floor beside your truck as it would be in the truck before you start.
This will help you visualise the layout.
And as britcon said,Take your time,be neat and tidy.
Most of all Good luck.
Jock
1950 Chevy Advance Design 3100 in ScotlandIn the Stovebolt GalleryMore pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.
| | | | | Joined: Oct 2008 Posts: 321 'Bolter | | 'Bolter Joined: Oct 2008 Posts: 321 | If you are replacing the wiring with original style harnesses then be sure to take lots of pictures before you tear out the old wiring. This will help you to see how the replacement goes in.
If you are using aftermarket universal harnesses then that is a slightly different thing but pics of how the old wiring was in the truck will still help. If nothing else it will give you ideas of how to run things.
Like everyone else has said, take your time. You will have a lot less headaches in the long run if you go slowly on the electrical system. Rushing things is where you end up with the dreaded electrical gremlins.
Oh, and welcome to the 'bolt!
1963 Chevy C20 Longbed Stepside
1978 Chevy K30 Custom Deluxe
| | | | | Joined: Dec 2006 Posts: 443 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 443 | Hello Loomup, welcome to the asylum. I just bought a complete wire harness for my truck from EZ Wiring. Something I don't look forward to. Let us know how it goes. Maybe you can give me a tip or two if you get yours done first. Happy wiring!
1957 Chevrolet 1/2-ton Stepside LB in the Gallery My Photobucket shots The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself." - John Stuart Mill (1806 - 1873) | | | | | Joined: Aug 2006 Posts: 84 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2006 Posts: 84 | Hey Loomup, well I'm in the Middle of doing my wiring harness on my 59 Chevy. I bought a wiring harness from Classic and so far everything is going smooth. I wish i would have done what bears63 said about taking pictures. I haven't needed the pictures as reference yet but you never know. Definitely lay out the wiring harness next to your truck to get a visual on were everything will go. It will help make sense of the mess of wires. Take your time and read the directions about 10 times before you start anything.
I have always hated anything that had to do with electrical and i wasn't looking forward to doing my wiring harness. But so far so good. If i can do it anybody can..good luck. JOSH | | | | | Joined: Dec 2006 Posts: 24 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2006 Posts: 24 | Hey Loomup
I use this trick I do not hook up the battery I use a 1 amp 12v battery charger you get the 12v but you do not get the 500-1000 amps of a good hot battery if you make a dead short, you do not get the smoke. Just hook the POS to the Pos Battery cable and the Neg to the Neg battery cable. With no battery. Works like a charm. Have fun! Now you know why they invented "Crown Royal Whisky" Later Sam T | | | | | Joined: Mar 2008 Posts: 3,750 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 3,750 | Sam T, thanks for the tip! I'm going to be tackling mine soon. Alan's 57, the good thing is the EZ kit is labelled every 5" ! I'm actually quite looking forward to doing mine! 
1950 Chevy Advance Design 3100 in ScotlandIn the Stovebolt GalleryMore pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.
| | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | T I used heat shrink tubing on the splices as well for extra protection. I like to double the heat shrink for added protection. All it takes is one stran of wire to poke threw to ruin your day....joe Good idea Joe! Where were you when I started rewiring? :mad:
~Jim
| | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | The best advice I can give anyone starting to rewire is: TAKE YOUR TIME AND READ AND REREAD THE DIRECTIONS! WHEN YOU GET TIRED QUIT!
~Jim
| | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | Oh yeah, AND SOLDER EVERY CONNECTION!
~Jim
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