Re: How to wire ignition (not a tractor)

Posted by John T on September 10, 2019 at 14:09:13 from (45.16.200.171):

In Reply to: How to wire ignition (not a tractor) posted by JDEM on September 10, 2019 at 13:01:58:

Hey John, fun question for us sparkies. For years and years I have read articles stating the current a set of mechanical contact points switches on Kettering Ignition systems should be limited to no more then 4 amps otherwise the points will burn prematurely but I have no idea as to the quality and current rating of your ignition points so they may be more or less ???

Of course I cant envision wiring two so called 12 Volt coils (if that's what they really are???) in series on a 12 volt system meaning each only sees 6 volts but that would reduce the current the points must switch and increase their life. If the spark energy is still sufficient it may still "work"

But if you run them in parallel which cuts resistance in half the points may burn too quick???

At tractor shows Ive seen conversion kits (for points and coil ignitions) that only use the points current as a trigger so they carry low current and Im sure you are familiar with the old Capacitor Discharge boxes that were easy n simple to wire and they can reduce points current.

I would be tempted to try them in series as that reduces points current and see if the spark is sufficient??? If you want to insure 12 volts on a 12 volt coil (run 2 in parallel) Id try one of the conversion kits and/or an old CD ignition box.

As you're well aware the condenser needs matched to the coil, but if you run two in series or parallel Id imagine that should change but that's deeper math then I want to get into now lol. Condensors add capacitance if in parallel while Inductors (coils) add inductance in series soooooooooooo if you ran two coils in series perhaps you should run two condensors in parallel THINK ABOUT IT. If you ran two coils in parallel the inductance cuts in half so maybe a condenser with 1/2 the capacitance NO WARRANT LOL PLAY WITH IT

Many two cylinder engines like some of the Onan gensets used two terminal ignition coils, might something like that work ????

Hey you have fooled with this type stuff for years I'm sure and am confident you will experiment and come up with the best results BUT LET US KNOW WHAT YOU END UP WITH !!!!!!!!!!!! I used to convert old outboards over to elec switches and that was fun.

Fun chat

John T Too long retired n rusty electrical engineer to answer this

Replies:

• Re: How to wire ignition (not a tractor) JDEM 15:41:06 09/10/19 (1)
  • Re: How to wire ignition (not a tractor) John T 17:52:28 09/10/19 (0)

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