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| | | | Joined: Aug 2011 Posts: 36 'Bolter | | 'Bolter Joined: Aug 2011 Posts: 36 | I have a 50 chevy with 12v alternator, but the coil is 6v. can this work correctly? | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | Not really- - - -it would require a much higher resistance than even the regular ballast resistor provides. "12 volt" coils actually operate at approximately 9 volts so they can work efficiently during cold-engine cranking when the terminal voltage drops. A bypass circuit is provided during cranking to eliminate the resistor. Once the engine is running, the resistor goes back into the circuit to protect the points from overcurrent burning, something that will happen very quickly if you try to use the 6V coil on 12 volts.
Use the correct coil, and add a resistor and a starting bypass circuit like the later-model trucks had. If you've got a stomp-type starter, a switch from a 12 volt starter can be installed on the 6V starter. It has the bypass terminal necessary for correct 12V ignition wiring.
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: Aug 2011 Posts: 36 'Bolter | | 'Bolter Joined: Aug 2011 Posts: 36 | Thanks,I didnt think it was right, but it has been starting and running the last 2 yrs. I 've been working on the body.It hasn't been started in a few months and yesterday when I triedit had no fire | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | Check the condition of the points. Most likely, you'll find them burned from carrying the excessive current the 6V coil allows when it's running on 12 volts. Temporarily, you can clean up the points with a fine-cut file or some sandpaper, but they'll need to be replaced before you hit the road. An ignition resistor for any late 50's/early 60's GM vehicle will work with the 12V coil to get the point current right.
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: Aug 2011 Posts: 36 'Bolter | | 'Bolter Joined: Aug 2011 Posts: 36 | Thanks,I'll give it a try | | | | | Joined: Aug 2011 Posts: 36 'Bolter | | 'Bolter Joined: Aug 2011 Posts: 36 | If I use a 12v internally regulated coil will I still need the ignition resistor? | | |
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