mcferreira100 Posted August 5, 2013 Share Posted August 5, 2013 Took the bike for bit of a run..on the way back noticed indicators not working anymore or headlight bulb. I have not done anything with wiring yet only replaced bulbs not working. Some wiring was missing when I got it so no battery wiring in place yet, no fuses and no loom to rear lights. Indicators were working when I got it so just replaced headlight bulb and neutral/2 stroke idiot bulbs. Should I replace voltage regulator/rectifier before it blows more bulbs? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 5, 2013 Moderator Share Posted August 5, 2013 the regulator and rectifier are different units.. The regulator is an AC regulator and will stop the headlamp bulb from blowing, it does not stop any of the other lamps from blowing...a good battery looks after the rest of the bulbs Link to comment Share on other sites More sharing options...
mcferreira100 Posted August 5, 2013 Author Share Posted August 5, 2013 So if no battery connected it puts bulbs at risk of blowing? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 5, 2013 Moderator Share Posted August 5, 2013 So if no battery connected it puts bulbs at risk of blowing? yes all except the headlight as I said...AC regulator looks after the headlight Link to comment Share on other sites More sharing options...
mcferreira100 Posted August 5, 2013 Author Share Posted August 5, 2013 Don`t see a regulator on Yambits..only a rectifier..also not in parts book, although I do see it on the circuit diagram. Can you tell me what`s the difference between the two and what does this thing look like..where does it sit? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 5, 2013 Moderator Share Posted August 5, 2013 Its an aluminium casting with cooling fins on the surface mine is on the back of the battery compartment behind tha chainguard so therefore it has a black chassis return wire from one of the mounting bolts. It has a yellow/white wire attached to it Link to comment Share on other sites More sharing options...
mcferreira100 Posted August 5, 2013 Author Share Posted August 5, 2013 Ok..I`ve seen this sitting there. Do you think they will be the same on 79 and 80 models? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 5, 2013 Moderator Share Posted August 5, 2013 even if they are not the same they will do the same job providing you mount it correcty with a black wire on a ring terminal to the mounting screw. The difficulty may be...removing the screws. Because it's in a wet area and the screws will rust into the flimsy mouting bracket which may start to bend if you are over zealous trying to undo them...penetrating oil and caution would be the order of the day. They are very reliable...obvious faults are The yellow wire snaps where it meets the body of the regulator The epoxy fill may be bulging out the back of the unit either of these will render the unit as trash but if none of this is evident I'd check the bracket is securely connected to black...ie battery negative For many years I have used an alternative version as fitted to DT50 and some other models Here are pics Correct standard version with integral wire And the one I have succesfully used for many years, I like the fact that this one has a plug on connection so it's not trash if the wire breaks. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 5, 2013 Moderator Share Posted August 5, 2013 and you still see them around http://www.ebay.co.uk/itm/Yamaha-DT50-MX-Rectifier-breaking-complete-bike-/200679723794?pt=UK_Motorcycle_Parts_13&hash=item2eb9719312#ht_1473wt_721 but dont rush into buying one until you are sure yours is toast Link to comment Share on other sites More sharing options...
mcferreira100 Posted August 5, 2013 Author Share Posted August 5, 2013 If not that then a short somewhere. How does one go about finding a short? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 5, 2013 Moderator Share Posted August 5, 2013 with a multimeter...we'll cross that bridge when we come to it Anyhow I have a hunch that when you fit a good battery...all your troubles will be over Link to comment Share on other sites More sharing options...
mcferreira100 Posted August 5, 2013 Author Share Posted August 5, 2013 ok..have a good battery from second bike so just need to steal some wiring as well to get it on. Link to comment Share on other sites More sharing options...
mcferreira100 Posted August 6, 2013 Author Share Posted August 6, 2013 Ok wired up battery..neutral & 2 stroke lights as well as hooter working off battery. this is regulator on 1980 bike. this is the 1979 bike but now all the indicators completely dead..even idiot light.. the bulbs look ok..where do I check? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 6, 2013 Moderator Share Posted August 6, 2013 the fuse blown? Link to comment Share on other sites More sharing options...
mcferreira100 Posted August 6, 2013 Author Share Posted August 6, 2013 Dunno..where does that fuse sit? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 6, 2013 Moderator Share Posted August 6, 2013 next to the battery in the red wire Link to comment Share on other sites More sharing options...
mcferreira100 Posted August 6, 2013 Author Share Posted August 6, 2013 ok saw that fuse..its ok...problem is somewhere else. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 6, 2013 Moderator Share Posted August 6, 2013 Check you have 6 v on the brown wire when the key is on...theres a brown on the rear brake isnt there?...or the indicator relay Link to comment Share on other sites More sharing options...
mcferreira100 Posted August 6, 2013 Author Share Posted August 6, 2013 Can this be checked without a multimeter? May be time I Invested in one. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 6, 2013 Moderator Share Posted August 6, 2013 Can this be checked without a multimeter? May be time I Invested in one. Yep...get one! Cant you borrow one for now? Link to comment Share on other sites More sharing options...
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