Question-------------------------
Followup To
Question - Bill thanks for you very quick response... now just a few points to clarify how I need to wire this engine.
I run the hot side of the battery to hot side of the coil. Is there just one wire that comes from the stator that I run to the rectifier? And is this on the ground side of the battery? Where do the points get wired into this?
I guess what I'm asking is I don't exactly understand how the schematic would look. I really appreciate your help. What are good sources for the gel type battery?
thanks,
Jeff
Bill,
I have an old trail 90 engine and most of the wiring harness is gone. I would like to run the engine off the mag if possible. I have no need for lights, etc. just need a spark. Can the battery, key switch, etc. be by-passed and can I run a wire from the mag to the points? If you have an idea of what color the wire would be that would be great too.
Answer -
Jeff, bad news... despite their Trail bike labels, CT90s have a battery operated ignition system, unlike the 50-70cc machines, which do have magnetos.
The stators do supply AC voltage constantly to the rectifier, which changed AC to DC voltage, but the system needs a battery to anchor the system, otherwise it goes into a no-load output which exceeds the normal output and damages light bulbs and other electrical components.
Back in the 70s, I think, people did adapt a large condensor as sort of a battery eliminator/load source to many bikes, especially Brit machines. With the advent of electronic ignitions/CDI units, the need for those accessory items has dropped off to nothing.
You might want to find a substitute gel battery in 6v size to replace the fragile wet cell battery, though. You can substitute the ignition switch with a toggle switch, basically to run battery voltage to the hot side of the coil (usually black wire). You will still need to run wires from the stator to the rectifier to the battery to keep the volts up for a reliable ignition output.
Bill Silver
AnswerGround to -Batt+ to Ign Sw/Toggle Sw to +side of coil to
-side of coil to points
Stator Yellow/Pink/Brown wires to: Rectifier to: +Batt- to Ground.
Usually one of the stator wires goes up to the headlight switch and connects back to the rectifier when the lights are turned ON. You can leave it open or tie it back to the rectifier terminal.
Try electronics houses for gel batteries.
Bill Silver
