I went to an automotive swap meet this past Sunday and found a pile of crap snowblower with to my surprise had a to what I believe a HS50 on it with a lighting coil! I paid 25 bucks for it and lugged it home. I got it running and the light works. Question. There is only one wire. I was hoping to use this on another HS50 and use it for my 1970 Rupp Roadster that has a 3 wire plug. Can this be adapted or no?
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If the other HS50 you have is electronic ignition (external coil) yes you can use it. You may find the lugs under the flywheel are not drilled an tapped for the bolts though, but there is usually a divit in place to do that yourself and get it where it needs to be, depends on the application of the engine when it left the factory if they drilled them or not.
what you have is a
18 watt a.c. lighting coil for an optional light on the snowblower (information posted above is incorrect) If your OK with just one light you can get away with just it just fine (depending on wattage of bulb). Not sure how light of wattage you can find in a par series headlamp that will fit your 1970 housing, but if you can get a really light wattage one you can also find a really low wattage bulb for the tail and maybe get away with that as well (no brake light though) so the 2 bulbs dont go too far over 18 watts when added together. Problem with low wattage headlamp might be that it does not give you that great of beam for driving, if the snowblower has a round light in it though you can probably just use that bulb on the bike.
They do make (or made, not real sure if they are available anymore) a plug in play to your Rupp harness 3 wire 3 amp A.C. lighted that will work with your 3 magnet flywheel as well. it puts out the same voltage and wattage as they did back in the 1970's and plug is configured the same. so its about 35w per leg on those. I have one stock NOS for @$100 shipped in the lower 48 if you cannot find one.
anything else they offered to work with a 3 magnet flywheel was charging only DC output and single wire. Those were used just to run a charge to a starter battery only (like on a forest gump size tractor or Troy built tiller etc..) ..... Tecumseh snow blowers NEVER HAD 12v electric start in these sizes, just 120v