1947 Cub 6 Volt and 12 Volt Quandary

[Rudi]

I went searching for an IC10SB in the archives and found this post.. for the NAPA coils.

Subject: coil with internal resistor??

I know we had discussed these coils before in another thread. Just searched and found itin the Pertoronics thread..

Here are the NAPA coils that they have available. Echilin is top end, MPE is the NAPA house brand.

Subject: Pertronix electronic ignition

Eugene:

Ask the counter person to see their "Engine Management Illustrated Parts Guide catalog. In my old catalog pages 73 - 94 list different coils. Pages 95 - 97 is an ignition coil usage chart.

I will have to see if I can get a copy of one of their old catalogs next time I go up. But maybe scans of the pages you have might be an option

This is what I have found so far after searching the NAPA PartsPro Search Engine.. Oh I like this part of the NAPA site.. the other one just is such a PITB

6 Volt Coils - Require External Resistor For 12 Volt Systems


• Part: ECH IC7 Product Line: Echlin Ignition Price:$51.49
  Part: MPE IC7SB Product Line: Mileage Plus Electrical Price: $18.29
  
• Part: ECH IC10 Product Line: Echlin Ignition Price: $49.99 Each
  Part: MPE IC10SB Product Line: Mileage Plus Electrical Price: $17.69
  
• Part: ECH IC12 Product Line: Echlin Ignition Price: $45.49 Each
  Part: MPE IC12SB Product Line: Mileage Plus Electrical Price: $16.69 Each
  
• Part: ECH IC64 Product Line: Echlin Ignition Price: $35.99 Each
  Part: MPE IC64SB Product Line: Mileage Plus Electrical Price: $ 26.99 Each
  
• Part: ECH IC676 Product Line: Echlin Ignition Price: $58.99 Each
  
  12 Volt Coils
  
  
• Part: ECH IC14 Product Line: Echlin Ignition Price: $51.49 Each
  Part: MPE IC14SB Product Line: Mileage Plus Electrical Price: $18.69 Each No External Resistor Required.
  
• Part: ECH IC21 Product Line: Echlin Ignition Price: $42.99 Each Indicated 12 volts, does not indicate if External Resistor is Required.
  Part: MPE IC21SB Product Line: Mileage Plus Electrical Price: $17.29 Each Indicated 12 volts, does not indicate if External Resistor is Required.
  
• Part: ECH IC27 Product Line: Echlin Ignition Price: $54.49 Each Indicated 12 volts, does not indicate if External Resistor is Required.
  Part: MPE IC27SB Product Line: Mileage Plus Electrical Price: $12.79 Each Indicated 12 volts, does not indicate if External Resistor is Required.
  
• Part: MPE IC277SB Product Line: Mileage Plus Electrical Price: $13.99 Each No External Resistor Required

Would this list be essentially correct

There are a number of others, but these would seem to be the most likely tu be useful for our Cubs at least to my mind.

David, I agree ... I like the old timer parts guys. Most of them have forgotten more than a lot of the new ones will ever know. I have an AC-Delco guy that I to check a starter for a local Cub owner and a genny for me. He just has to look at a Cub starter or genny and he can rattle off all the parts that can go wrong. So far he has been bang on...

[jpate831]

Thanks again for the responses guys. I read every one and gave it some thought, and this afternoon I made my decision. I went and bought a 6-volt battery. I put the new battery on and gave it a shot. The starter turned more slowly than before (obviously), but after about two or three revolutions she fired up beautifully.

Some of the other odd symptoms went away as well. With the 12-volt battery, the coil would heat up very quickly. After I changed to the 6-volt battery, I ran the tractor for about ten minutes or so, and the coil never got hot like before. This leads me to believe it was a 6-volt coil. Also, with the 12-volt battery, the light switch (4-position) would sometimes put off a small puff of smoke after a couple minutes of running. After changing to the 6-volt battery, there's no smoke or evidence of any type of overload, and the switch still seems to work correctly.

I've experienced the 6-volt woes on some of the larger tractors I've had in the past, so I understand the value of a 12-volt system. However, in this case I wanted the cub to remain as original as possible. If slow starting becomes a problem in the future, I may opt for the alternator and the 12-volt setup. But for now, I couldn't be happier

Thanks for all of your valuable input. I wish I'd hooked up with you guys about 3 years ago when I started this project.

Jamie

[Rudi]

Jamie:

Glad you got the gremlins figured out. Judging by the last post.. the 12 volt battery was just popped in by the PO without doing anything else. The real secret to a 6 volt system .. I guess any system really is to keep it maintained. In this case.. make sure that grounds are always good clean and bright, the battery terminals have no corrosion on them etc., Make sure that the proper gauge cable is used from battery to starter and things like that. A well maintained 6 volt system is as reliable as any 12 volt system. Winter or summer my Cubs always start when they need to (well Granny gets a break cause I only start her occasionally )

[bythepond88]

Jamie - glad to hear that a battery was all it took. As Rudi said, as long as you keep everything maintained, there is nothing wrong with a 6v system.

We wish we'd met you three years ago, too! But glad you showed up, and don't be a stranger. The group here is wonderful and has helped me more than I can say.