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Global Mod,
Mod | | | Forums66 Topics128,049 Posts1,055,691 Members48,426 | | 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: May 2021 Posts: 52 'Bolter | | 'Bolter Joined: May 2021 Posts: 52 | Wiring my 54 3600. Changing to 12 volt. New auto wire harness. 12 volt stater and generator. Do I need a ballast resistor between ignition and coil?
Thanks | | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | Only if you want the points to last more than a few weeks. The operating voltage for a "12 volt" electrical system will be around 14.5 volts against a fully charged battery. Points need to have a current flow of less than 5 amps, which usually happens with about 9.5 volts applied to the coil primary winding. That's why a resistor is needed. When the starter is operating, the "12 volt" battery has a terminal voltage of around 9V due to the load of the starter. A correctly wired 12V ignition system will have a bypass switch that puts full battery voltage to the ignition system during cranking.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jun 2022 Posts: 557 'Bolter | | 'Bolter Joined: Jun 2022 Posts: 557 | I think Jerry said "yes."
~~ Jethro 1954 3100Back to LifeIn the Dity Gallery1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020 | | |
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