I have a '73 350 w/ Auto Trans. Tonight while driving along, the car cut
off, the headlights went off - no power at all. I coasted for a ways so I
could get out of the way - after about 30 seconds - power restored and the
car cranked and ran fine. I was running AC, radio and headlights. I turned
off AC but it happened a 2nd time while sitting at a stop light - power all
shut down - then about 30 seconds late - all restored. I have had it happen
in the past when it was raining - radio, headlamps, windsheild wipers and AC
I figure that there must be a short somewhere and the system is getting
overloaded? Any ideas. I would love to fix - it is kind of dangerous.
If you are still running the original points distributor, I would check the
capacitor. Make sure it has good contact with the strap and plate. It's a
very inexpensive part, replace it, and you can check it off the possible
C3s have some fusible links that can break with age as a fusible link is a
section of wire smaller gauge than the rest of the circuit. It is possible
that this has happened and as you have road vibration and heat, the wire
"opens" and you lose power. Then after 30 minutes of cooling, it closes
again and you run.
In some C3s, these are near the horn relay. In others, they are near the
starter. Check with a voltmeter or test light while flexing the wire. You
can buy the links at Chevrolet with the kit to install the big black lumpy
splice, or simply install a 3 inch piece of wire one or two gauges smaller
(numerically bigger) than the regular wire. For example, if the wire is 12
gauge, install a 14 or 16 gauge section.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.