Boosting coil voltage during starting

Posted by mkirsch on February 16, 2010 at 06:30:00 from (64.80.108.56):

The Super C doesn't fire until AFTER you let off the starter switch. Apparently the starter is drawing so much power that the spark is weak. I have no problems starting the tractor but it gives everyone else fits.

It's a 12V conversion, with a ballast resistor running to a 6V coil. Works fine when the battery is putting out 12+ Volts, but during starting the battery voltage drops. Different coils don't seem to make much difference.

Later tractors have a booster circuit off the solenoid that puts a full 12V to the coil during starting, but the C has a pull rod starter.

Is there a clever solution for providing 12V to the coil during starting on an old tractor like this?

What I do NOT want is a toggle switch that you have to remember to turn on and off. I'd like something that sends 12V to the coil when you pull the starter rod.

Replies:

• Re: Boosting coil voltage during starting Bryce 17:54:06 02/17/10 (0)
• Re: Boosting coil voltage during starting JMOR 07:57:12 02/17/10 (0)
• Re: Boosting coil voltage during starting mkirsch 05:29:10 02/17/10 (1)
  • Re: Boosting coil voltage during starting Janicholson 06:32:09 02/17/10 (0)
• Re: Boosting coil voltage during starting Jim Becker 16:59:42 02/16/10 (0)
• Re: Boosting coil voltage during starting Tom Fleming 16:49:02 02/16/10 (0)
• Re: Boosting coil voltage during starting cd1 11:20:25 02/16/10 (0)
• Re: Boosting coil voltage during starting Red Mist 11:00:52 02/16/10 (0)
• Re: Boosting coil voltage during starting Bob M 09:31:40 02/16/10 (2)
  • Re: Boosting coil voltage during starting Janicholson 10:00:10 02/16/10 (0)
  • Re: Boosting coil voltage during starting Janicholson 10:00:09 02/16/10 (0)
• Re: Boosting coil voltage during starting gene 09:17:44 02/16/10 (0)
• Re: Boosting coil voltage during starting John T PS 09:05:27 02/16/10 (1)
  • Re: Boosting coil voltage during starting Bob M 09:39:47 02/16/10 (0)
• Re: Boosting coil voltage during starting mkirsch 08:39:33 02/16/10 (0)
• Re: Boosting coil voltage during starting The tractor vet 07:36:59 02/16/10 (0)
• Re: Boosting coil voltage during starting Janicholson 07:21:42 02/16/10 (0)
• Re: Boosting coil voltage during starting John T 06:58:31 02/16/10 (4)
  • Re: Boosting coil voltage during starting Jeff Z. 08:52:59 02/16/10 (3)
    • Re: Boosting coil voltage during starting John T 08:56:04 02/16/10 (1)
      • Re: Boosting coil voltage during starting Janicholson 09:48:34 02/16/10 (0)
    • Re: Boosting coil voltage during starting Jeff Z. 08:55:31 02/16/10 (0)

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