cdubb Posted May 2, 2013 Report Share Posted May 2, 2013 Hi, I was wondering if anyone could give me more specs of the Tail Light Bulb (Part No. 26.21-047) used on a 421-048 style tail light. I currently have a single filament bulb. The only time I can make the bulb light up is when I close the hi-beam switch. I am wondering if it is supposed to be a 2-filament bulb. If possible, can you give me a more commercial part number rather than a Bultaco serial number for the proper bulb. If the part numbers referenced above are not factory part numbers then reference the Bultaco.com website and service manual for details. Thanks Quote Link to comment Share on other sites More sharing options...
copemech Posted May 3, 2013 Report Share Posted May 3, 2013 2 filament bulbs will have two contacts in the socket(add the case for earth), what does yours have? The fact it lights when applying high beam is a bit more disturbing? Quote Link to comment Share on other sites More sharing options...
cdubb Posted May 3, 2013 Author Report Share Posted May 3, 2013 The bulb I currently have has one filament thus one contact on the bulb. As for the light socket, it only has one tab, I believe it is intended for one or two contacts on the bulb, the latter being parallel and both would contact the tab simultaneously. Is that an electrically correct statement? I must say I am terrible with electrical engineering; I've taken the engineering entry level electrical course 4 times . Quote Link to comment Share on other sites More sharing options...
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