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Click on image for the lowdown. 
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| | | Forums66 Topics128,080 Posts1,056,062 Members48,433 | | 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!
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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: Feb 2001 Posts: 80 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2001 Posts: 80 | Most '63 to '74 vehicles used a points and condenser system, with a resistance wire enclosed in the harness (from the firewall to the coil). The wire (yellow) from the "R" terminal of the GM solenoid routes to the "plus" terminal of the ignition coil, and its purpose was to bypass the ballast resistor during cranking for hotter spark. If you have an electronic igniton, there is no need for this wire. | | |
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