LeeYorks Posted September 2, 2015 Share Posted September 2, 2015 Hello all i have a dt125r which is giving me grief.... lights have died. I have electrics, indicators work, brake lights but no main lights or instruments. I know they work off another circuit and indicators work off battery before anyone shouts... however, I have disconnected battery and fired up with kick start, indicators still work still no lights. I therefore assume that charging circuit is working or I wouldn't have indicators or brake lights. I've tried chasing the cables but it's a night mare..... ... Any suggestions from anyone as to where to look next please thanks in advance Link to comment Share on other sites More sharing options...
KevtheRev Posted September 3, 2015 Share Posted September 3, 2015 Link to comment Share on other sites More sharing options...
Moderator Cynic Posted September 3, 2015 Moderator Share Posted September 3, 2015 Check your rectifier and ilight sw. Link to comment Share on other sites More sharing options...
LeeYorks Posted September 3, 2015 Author Share Posted September 3, 2015 Thanks Cynic... I had thought rectifier possibly but don't know how to check. Can't be light switch as putting a live feed off battery then gets lights working again.whats confusing me is that with no battery connected I still have indicators and brake lights when engine is running but no lightswill happily bow to your wisdom and advise but didn't want to just keep throwing money at it by changing parts randomly. Is it possible to check a rectifier?thanks againmuch rather work on my Africa Twin.... Seems far more logical :) Link to comment Share on other sites More sharing options...
Moderator Cynic Posted September 3, 2015 Moderator Share Posted September 3, 2015 Strange statement re the AT. Compare the wiring and it will be very similar.If you can power the switch up and get lights i would think there is a specific failure somewhere between the lighting coil in the mag and the switch.That should be easy to test with just a bulb. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted September 3, 2015 Moderator Share Posted September 3, 2015 easy to check a rectifier. set your multimeter to continuity (ohms), touch the terminals on the rec and than switch the meter probes to the other terminal...you will only get continuity in one direction Link to comment Share on other sites More sharing options...
LeeYorks Posted September 3, 2015 Author Share Posted September 3, 2015 Thanks again guys, will look at when I get home. Can you please clarify cynic, you said lighting coil in mag... Is this something separate in engine??sorry for asking, I hate electric problems!i took a lead straight of battery and powered lighting circuit at which point the switch was turning it on and off etc so had assumed switch ok. Got to be somewhere in cables or electrics from when it generates it to switch although I don't understand how indicators can get to work with no battery unless there is a separate circuit just for generating power to lights??i could try bypassing issue and feeding off live feed from ignition but I hate doing that as there is obviously an issue somewhere! Link to comment Share on other sites More sharing options...
Moderator Airhead Posted September 3, 2015 Moderator Share Posted September 3, 2015 I'm surprised the indicators worked without the battery,.... so they wont work without the engine running then Link to comment Share on other sites More sharing options...
LeeYorks Posted September 3, 2015 Author Share Posted September 3, 2015 The bike never came with a battery Airhead.... Everything worked fine once running. when I put battery in that minor electrics such as indicators work off that when not running but lights on separate circuit it seems which is why I think rectifier is doing its job.... Getting slowly confused!! Link to comment Share on other sites More sharing options...
Moderator Cynic Posted September 3, 2015 Moderator Share Posted September 3, 2015 I think there may be a wiring issue, I don't think the rectifier is dead.The charging will go via the rectifier and this will power the dc stuff like the indicators. The lighting feed bypasses the rectifier and goes to the lighting switch, sometimes via the ig switch.I think its a white wire from the rectifier to the light switch that your looking for. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted September 3, 2015 Moderator Share Posted September 3, 2015 normally everything works off battery apart from the headlight but its been a while since I had one of these so cant be certain Link to comment Share on other sites More sharing options...
Moderator Cynic Posted September 3, 2015 Moderator Share Posted September 3, 2015 Yeah, That is what my TDR does, still means the rectifier is ok and the wiring to the sw is suspect. For me it keeps coming to the same thing. A wiring problem in the lighting switch feed. Link to comment Share on other sites More sharing options...
LeeYorks Posted September 6, 2015 Author Share Posted September 6, 2015 Update!!!! think I have eventually tracked down 2 dodgey cables from magneto that were badly spliced. However..... whilst testing I was running the bike on battery and accidentally unplugged the battery causing engine to stop straight away! Now the bike won't start at all, when you turn key ignition lights come on but you can't hear the power valve servo start so I'm guessing there is no power going to that or the ignition coil ( hence no spark) could I have blown the rectifier or may I have buggered the main cdi unit back to you Cynic, you were right on the original diagnosis I think but can't confirm until I get bike starting again Link to comment Share on other sites More sharing options...
Moderator Cynic Posted September 6, 2015 Moderator Share Posted September 6, 2015 Have you checked the fuses? Link to comment Share on other sites More sharing options...
LeeYorks Posted September 7, 2015 Author Share Posted September 7, 2015 Only one fuse as far as I'm aware, Nepal light working and indicators so that's ok will try hitting it with a bigger hammer this evening Link to comment Share on other sites More sharing options...
LeeYorks Posted September 7, 2015 Author Share Posted September 7, 2015 Ok cycnic... Update number 2 engine won't kick over, I can only find 1 fuse next ti battery and wiring diagram only shows 1. situation is as follows... Neutral light and oil come on with ignition and one of relays clicks, BUT the power valve makes no noise which it should do when turned on as servo gets power. No spark when kicking over only ideas I have at moment looking at wiring is cdi unit as all cables lead there or rectifier. This is my sons bike and I'm on verge of having to tell him it may have to be scrapped for parts if I can't get it running again. I've checked cables as much as I can. Reluctant to spend more money on it or wife will go mad if it doesn't fix it.... Last plea for help.... Could rectifier be blown?.... Had no hair to start with but def none left now, son gutted as he was hoping to take bike up north next week for a trip Thanks for your support so far guys Lee Link to comment Share on other sites More sharing options...
Moderator Airhead Posted September 7, 2015 Moderator Share Posted September 7, 2015 does the horn work with the main switch in ON position?, it should do Link to comment Share on other sites More sharing options...
LeeYorks Posted September 7, 2015 Author Share Posted September 7, 2015 Hi airhead... Yes horn works when ignition turned on, same as indicators and brake light Link to comment Share on other sites More sharing options...
Moderator Airhead Posted September 7, 2015 Moderator Share Posted September 7, 2015 I suppose all the connectors to the ignition module are clan and good? Link to comment Share on other sites More sharing options...
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