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Click on image for the lowdown. 
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| | | Forums66 Topics128,091 Posts1,056,449 Members48,443 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2005 Posts: 121 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2005 Posts: 121 | Looks like factory wire harnesses going to the relays. Did GM offer a factory trailer wiring harness in 71?
Dave
66 GMC- father /son project with the "GMC KID"
36 Chevy PU- 4x4 lifetime project
64 Skylark- wife says its hers
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