Corbstar

Hi all again. Just want to check out the wireing I seem to have, I'm getting confused with the various diagrams out there. This is the Dt 400 b with cdi. I've got 6 wires coming from the flywheel and they are yellow, green red and both conect to the same colour at junction but there is also the green white from loom that just stops there? Then it's white green, white red, black - all on another moulded black conector so you can't plug in the wrong way round, last cable is brown on its own conector. That all looks correct with main cdi flywheel diagrams and they clearly show the two wires, yellow and green red on one four way connector but I can't make out the green white running through the loom from light switch all the way back to that connector but then no connection?? It just stops there. The green white in question seems to be on the light circuit for day time while green red is night time running. Help!

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Ok will do, my regulator is new one and purely on the headlamp feed yellow. Really not sure if it needs to be back in the loom somewhere?

Yes that's it, just the battery level at tick over and then when lights on it goes up to 8v with revs but only slight change with lights off, i thought it should read more than 6 on tick over but thinking about it i am testing at battery?? Putting new battery on next, I don't think I've been very methodical with this- could you give me the best plan of order to test and give you guys the most accurate info? Cheers.

Ahhhh. Still no joy, nothing really at tick over but up to 8 v at 8k rpm with lights on. Also cleaning tank today, trying the spirit of salts method. Works pretty well, sleep on the electrics for now.

Thanks, really appreciate the info. I'm going through it all.

Yes real frustrating. Where about in loom did you hook it up, mine is on the yellow feed to front lamp. Well I think it is, just spliced in. Now I'm wondering if that's part of the problem? Also noticed when any load on ie brake, horn, lights the voltage drops to 0 with bike running.

Ok that makes sense. Connections! It is original loom and I thought I'd cleaned all but now understand just how one little bad one will play up. I've tested rectifier both ways and its showing .538 and reversed 1 on digital tester, I've actually got two rectifiers, the original and a new one, both about the same? Do I need fully charged battery for real accurate readings? The one on right now is only about 4.9 volts and I think cooked as again I think the middle cell got low. I guess that means something must be charging?

Hi there. It's in competition yellow. Californian import, all re registered and road legal now. Absorlutely love it, just this charging problem and the usual fuel tank inner starting to go around flue cap. Think I shoud just ride and enjoy but I'm a sucker for everything being right!

I'm getting nothing with lights off and about 8v at 6-7000 rpm with lights on. I've put a new regulator on the light side of loom but it never had one anywhere else. The workshop manual I've got claims if all correct then it shouldn't need regulator? I've done the basic test on rectifier and it seems ok, only reading one way round? Brake lights, horn all on battery, front beam and dials on engine. Corbstar.

Many thanks for the welcome and fingers crossed some fellow stinky wheelers get back to help me out!

Hi all, finally found the DT area! My 1975 dt 400 b seems to charge ok with lights on but nothing when in day time-lights off? I'm on the second battery and both have lost, gassed fluid and needed topping up regularly. It's getting a few short blasts on road as re commissioning but all runs well. Lights, horn fine with good battery. Rectifier seems ok with tester, any thing obvious to check? I really can't understand how this system should work. Corbstar uk.

I'm the Corbstar and would like to say hi to all out there! My 1975 dt 400 is running pretty good but has some of the usual electrical woes as a road going machine. Just wondering who, where might be best to post for this bike. Over n out.

Hi all. I'm new to site so sorry if I'm in the wrong end but thought I'd start with my electrical dt 400 woes and let someone guide my through! This bike runs, lights, horn all work, no blowing bulbs etc. 2nd battery now and both seem to of chucked the fluid out through vent pipe. Having to top up regularly but I am only just re commissioning with short road blasts. I'm a novice but can say charge looks good with lights on and revs up but no charge in daytime lights out. Something obvious to look for? Corbstar uk.