Posted February 25, 201311 yr Hi all I have a 1977(poss 78) Yamaha RS 125 DX. Headlamp bulbs last less than a mile before the high beam pop shortly followed by the dipped.My mechanic has checked all the wires and corrected some earthing errors but it continues to happen. He has as good as washed his hands of it now. He did sugest the regulator could be at fault but I cant find mention of it anywhere in Haynes or on the web. Even Yambits who are generally good for parts don't know where it is. They are insistent that it is not built into the rectifier. Does it even exist?? I assume it must have one...if so where??? Is there anything else which could be causing the problem? HELP....seems like it should be a simple fix but I'm struggling to even get the info to get started. Thanks
February 25, 201311 yr Moderator some of the early bikes didnt have a regulator, if you cant find one this may be the case with yours...havent you got a haynes book then? Perhaps the battery is fubared, the battery will sink away some of the excess but if it's low on electrolyte or sulphated it wont do so we have a @new Member' forum for intros ya know
February 25, 201311 yr Author Thanks I'll check the battery................and the new members forum. I would have thought my mechanic would have done that though whilst checking the wiring. Starts and sparks fine so and all lights seem ok otherwise so Im not sure if it will be the battery. Worth a look though. I do have a haynes but keep being told that they dont have all parts listed. Suppose I should get a parts list! Any one fancy scanning one for me!!!!!!!??????
February 25, 201311 yr Moderator never seen one myself but if its not in the wiring diagram it wont have one however I have seen some quirky things in built in the looms before...!
February 25, 201311 yr Author Would other bulbs be blowing too if it was a battery problem.......just a thought!
February 25, 201311 yr Moderator yeah maybe It would be good to see the wiring diagram, any chance you could scan it and attach to a PM to me?
February 25, 201311 yr Author That would be great...but I'm having a mare uploading images ....how do i do it???
February 26, 201311 yr Moderator click my username>send message>use full editor and send the scanned file (attachment)...I'm off now will check in tomorrow
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