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Farmall Tractors Discussion Board |
Re: Re: Re: Re: Super A -- 12 volt system?
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Posted by Larry on June 06, 1999 at 08:06:46 from (206.228.213.158):
In Reply to: Re: Re: Re: Super A -- 12 volt system? posted by BDM on June 05, 1999 at 21:50:46:
You do not want to get the spark too hot on any old tractor as you will possibly be inviting problems such as arcing. The insulating materials and air gaps are not the same as in modern equipment. For good reliability get an old 60s vintage GM coil. Put a key start ignition switch on the tractor. Use a Ford fender mounted solenoid. Mount a dropping resistor. From the start position on the switch run your wire 16 ga. to the side ign. terminal on the solenoid. From the battery hot side of the solenoid (large stud)connect the + cable from the battery and also run from this stud a 16 gauge wire to the bat. position on the switch. Connect the starter lead to the remaining large stud on the solenoid. From a run position on the ignition switch run a 16 ga. wire to one side of the dropping resistor. From the other side of the dropping res. go to the hot side of the coil +. For hard to start equipment you can add, adjacent to your key switch, a second momentary switch. The normally open type used as starter buttons on many machines. Use it as a jumper to short across the dropping resistor(run one 16 ga. wire from the start position on the key sw. to one terminal on the push button sw., from the remaining terminal on the P.B. sw run a 16 ga. wire to the + on the coil, hold this in during cranking will give you cranking at 12 volts to the ignition and running on approx. 6 volts when released. There is a Ford type solenoid on the market that has an auxillary contact that will let you accomplish the same thing as the manual push button but I do not remember the part number.
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